<?xml version='1.0' encoding='UTF-8'?>
<FilingSummary>
  <Version>3.5.0.2</Version>
  <ProcessingTime/>
  <ReportFormat>html</ReportFormat>
  <ContextCount>106</ContextCount>
  <ElementCount>215</ElementCount>
  <EntityCount>1</EntityCount>
  <FootnotesReported>false</FootnotesReported>
  <SegmentCount>36</SegmentCount>
  <ScenarioCount>0</ScenarioCount>
  <TuplesReported>false</TuplesReported>
  <UnitCount>5</UnitCount>
  <MyReports>
    <Report instance="ff-20160930.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R1.htm</HtmlFileName>
      <LongName>000 - Document - Document And Entity Information</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.futurefuelcorporation.com/20160930/role/statement-document-and-entity-information</Role>
      <ShortName>Document And Entity Information</ShortName>
      <MenuCategory>Cover</MenuCategory>
      <Position>1</Position>
    </Report>
    <Report instance="ff-20160930.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R2.htm</HtmlFileName>
      <LongName>001 - Statement - Consolidated Balance Sheets (Current Period Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.futurefuelcorporation.com/20160930/role/statement-consolidated-balance-sheets-current-period-unaudited</Role>
      <ShortName>Consolidated Balance Sheets (Current Period Unaudited)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>2</Position>
    </Report>
    <Report instance="ff-20160930.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R3.htm</HtmlFileName>
      <LongName>002 - Statement - Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.futurefuelcorporation.com/20160930/role/statement-consolidated-balance-sheets-current-period-unaudited-parentheticals</Role>
      <ShortName>Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>3</Position>
    </Report>
    <Report instance="ff-20160930.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R4.htm</HtmlFileName>
      <LongName>003 - Statement - Consolidated Statements of Operations and Comprehensive Income (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.futurefuelcorporation.com/20160930/role/statement-consolidated-statements-of-operations-and-comprehensive-income-unaudited</Role>
      <ShortName>Consolidated Statements of Operations and Comprehensive Income (Unaudited)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>4</Position>
    </Report>
    <Report instance="ff-20160930.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R5.htm</HtmlFileName>
      <LongName>004 - Statement - Consolidated Statements of Cash Flows (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.futurefuelcorporation.com/20160930/role/statement-consolidated-statements-of-cash-flows-unaudited</Role>
      <ShortName>Consolidated Statements of Cash Flows (Unaudited)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>5</Position>
    </Report>
    <Report instance="ff-20160930.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R6.htm</HtmlFileName>
      <LongName>005 - Disclosure - Note 1 - Nature of Operations and Basis of Presentation</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.futurefuelcorporation.com/20160930/role/statement-note-1-nature-of-operations-and-basis-of-presentation</Role>
      <ShortName>Note 1 - Nature of Operations and Basis of Presentation</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>6</Position>
    </Report>
    <Report instance="ff-20160930.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R7.htm</HtmlFileName>
      <LongName>006 - Disclosure - Note 2 - Inventory</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.futurefuelcorporation.com/20160930/role/statement-note-2-inventory</Role>
      <ShortName>Note 2 - Inventory</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>7</Position>
    </Report>
    <Report instance="ff-20160930.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R8.htm</HtmlFileName>
      <LongName>007 - Disclosure - Note 3 - Derivative Instruments</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.futurefuelcorporation.com/20160930/role/statement-note-3-derivative-instruments</Role>
      <ShortName>Note 3 - Derivative Instruments</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>8</Position>
    </Report>
    <Report instance="ff-20160930.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R9.htm</HtmlFileName>
      <LongName>008 - Disclosure - Note 4 - Marketable Securities</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.futurefuelcorporation.com/20160930/role/statement-note-4-marketable-securities</Role>
      <ShortName>Note 4 - Marketable Securities</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>9</Position>
    </Report>
    <Report instance="ff-20160930.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R10.htm</HtmlFileName>
      <LongName>009 - Disclosure - Note 5 - Accrued Expenses and Other Current Liabilities</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.futurefuelcorporation.com/20160930/role/statement-note-5-accrued-expenses-and-other-current-liabilities</Role>
      <ShortName>Note 5 - Accrued Expenses and Other Current Liabilities</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>10</Position>
    </Report>
    <Report instance="ff-20160930.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R11.htm</HtmlFileName>
      <LongName>010 - Disclosure - Note 6 - Borrowings</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.futurefuelcorporation.com/20160930/role/statement-note-6-borrowings</Role>
      <ShortName>Note 6 - Borrowings</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>11</Position>
    </Report>
    <Report instance="ff-20160930.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R12.htm</HtmlFileName>
      <LongName>011 - Disclosure - Note 7 - Provision for Income Taxes</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.futurefuelcorporation.com/20160930/role/statement-note-7-provision-for-income-taxes</Role>
      <ShortName>Note 7 - Provision for Income Taxes</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>12</Position>
    </Report>
    <Report instance="ff-20160930.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R13.htm</HtmlFileName>
      <LongName>012 - Disclosure - Note 8 - Earnings Per Share</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.futurefuelcorporation.com/20160930/role/statement-note-8-earnings-per-share</Role>
      <ShortName>Note 8 - Earnings Per Share</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>13</Position>
    </Report>
    <Report instance="ff-20160930.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R14.htm</HtmlFileName>
      <LongName>013 - Disclosure - Note 9 - Segment Information</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.futurefuelcorporation.com/20160930/role/statement-note-9-segment-information</Role>
      <ShortName>Note 9 - Segment Information</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>14</Position>
    </Report>
    <Report instance="ff-20160930.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R15.htm</HtmlFileName>
      <LongName>014 - Disclosure - Note 10 - Fair Value Measurements</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.futurefuelcorporation.com/20160930/role/statement-note-10-fair-value-measurements</Role>
      <ShortName>Note 10 - Fair Value Measurements</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>15</Position>
    </Report>
    <Report instance="ff-20160930.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R16.htm</HtmlFileName>
      <LongName>015 - Disclosure - Note 11 - Reclassifications From Accumulated and Other Comprehensive Income:</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.futurefuelcorporation.com/20160930/role/statement-note-11-reclassifications-from-accumulated-and-other-comprehensive-income</Role>
      <ShortName>Note 11 - Reclassifications From Accumulated and Other Comprehensive Income:</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>16</Position>
    </Report>
    <Report instance="ff-20160930.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R17.htm</HtmlFileName>
      <LongName>016 - Disclosure - Note 12 - Legal Matters</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.futurefuelcorporation.com/20160930/role/statement-note-12-legal-matters</Role>
      <ShortName>Note 12 - Legal Matters</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>17</Position>
    </Report>
    <Report instance="ff-20160930.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R18.htm</HtmlFileName>
      <LongName>017 - Document - Note 13 - Related Party Transactions</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.futurefuelcorporation.com/20160930/role/statement-note-13-related-party-transactions</Role>
      <ShortName>Note 13 - Related Party Transactions</ShortName>
      <MenuCategory>Uncategorized</MenuCategory>
      <Position>18</Position>
    </Report>
    <Report instance="ff-20160930.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R19.htm</HtmlFileName>
      <LongName>018 - Disclosure - Note 14 - Intangible Asset</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.futurefuelcorporation.com/20160930/role/statement-note-14-intangible-asset</Role>
      <ShortName>Note 14 - Intangible Asset</ShortName>
      <MenuCategory>Uncategorized</MenuCategory>
      <Position>19</Position>
    </Report>
    <Report instance="ff-20160930.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R20.htm</HtmlFileName>
      <LongName>019 - Disclosure - Note 15 - Recently Issued Accounting Statements</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.futurefuelcorporation.com/20160930/role/statement-note-15-recently-issued-accounting-statements</Role>
      <ShortName>Note 15 - Recently Issued Accounting Statements</ShortName>
      <MenuCategory>Uncategorized</MenuCategory>
      <Position>20</Position>
    </Report>
    <Report instance="ff-20160930.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R21.htm</HtmlFileName>
      <LongName>020 - Disclosure - Note 2 - Inventory (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.futurefuelcorporation.com/20160930/role/statement-note-2-inventory-tables</Role>
      <ShortName>Note 2 - Inventory (Tables)</ShortName>
      <MenuCategory>Uncategorized</MenuCategory>
      <Position>21</Position>
    </Report>
    <Report instance="ff-20160930.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R22.htm</HtmlFileName>
      <LongName>021 - Disclosure - Note 3 - Derivative Instruments (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.futurefuelcorporation.com/20160930/role/statement-note-3-derivative-instruments-tables</Role>
      <ShortName>Note 3 - Derivative Instruments (Tables)</ShortName>
      <MenuCategory>Uncategorized</MenuCategory>
      <Position>22</Position>
    </Report>
    <Report instance="ff-20160930.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R23.htm</HtmlFileName>
      <LongName>022 - Disclosure - Note 4 - Marketable Securities (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.futurefuelcorporation.com/20160930/role/statement-note-4-marketable-securities-tables</Role>
      <ShortName>Note 4 - Marketable Securities (Tables)</ShortName>
      <MenuCategory>Uncategorized</MenuCategory>
      <Position>23</Position>
    </Report>
    <Report instance="ff-20160930.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R24.htm</HtmlFileName>
      <LongName>023 - Disclosure - Note 5 - Accrued Expenses and Other Current Liabilities (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.futurefuelcorporation.com/20160930/role/statement-note-5-accrued-expenses-and-other-current-liabilities-tables</Role>
      <ShortName>Note 5 - Accrued Expenses and Other Current Liabilities (Tables)</ShortName>
      <MenuCategory>Uncategorized</MenuCategory>
      <Position>24</Position>
    </Report>
    <Report instance="ff-20160930.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R25.htm</HtmlFileName>
      <LongName>024 - Disclosure - Note 6 - Borrowings (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.futurefuelcorporation.com/20160930/role/statement-note-6-borrowings-tables</Role>
      <ShortName>Note 6 - Borrowings (Tables)</ShortName>
      <MenuCategory>Uncategorized</MenuCategory>
      <Position>25</Position>
    </Report>
    <Report instance="ff-20160930.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R26.htm</HtmlFileName>
      <LongName>025 - Disclosure - Note 7 - Provision for Income Taxes (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.futurefuelcorporation.com/20160930/role/statement-note-7-provision-for-income-taxes-tables</Role>
      <ShortName>Note 7 - Provision for Income Taxes (Tables)</ShortName>
      <MenuCategory>Uncategorized</MenuCategory>
      <Position>26</Position>
    </Report>
    <Report instance="ff-20160930.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R27.htm</HtmlFileName>
      <LongName>026 - Disclosure - Note 8 - Earnings Per Share (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.futurefuelcorporation.com/20160930/role/statement-note-8-earnings-per-share-tables</Role>
      <ShortName>Note 8 - Earnings Per Share (Tables)</ShortName>
      <MenuCategory>Uncategorized</MenuCategory>
      <Position>27</Position>
    </Report>
    <Report instance="ff-20160930.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R28.htm</HtmlFileName>
      <LongName>027 - Disclosure - Note 9 - Segment Information (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.futurefuelcorporation.com/20160930/role/statement-note-9-segment-information-tables</Role>
      <ShortName>Note 9 - Segment Information (Tables)</ShortName>
      <MenuCategory>Uncategorized</MenuCategory>
      <Position>28</Position>
    </Report>
    <Report instance="ff-20160930.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R29.htm</HtmlFileName>
      <LongName>028 - Disclosure - Note 10 - Fair Value Measurements (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.futurefuelcorporation.com/20160930/role/statement-note-10-fair-value-measurements-tables</Role>
      <ShortName>Note 10 - Fair Value Measurements (Tables)</ShortName>
      <MenuCategory>Uncategorized</MenuCategory>
      <Position>29</Position>
    </Report>
    <Report instance="ff-20160930.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R30.htm</HtmlFileName>
      <LongName>029 - Disclosure - Note 11 - Reclassifications From Accumulated and Other Comprehensive Income: (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.futurefuelcorporation.com/20160930/role/statement-note-11-reclassifications-from-accumulated-and-other-comprehensive-income-tables</Role>
      <ShortName>Note 11 - Reclassifications From Accumulated and Other Comprehensive Income: (Tables)</ShortName>
      <MenuCategory>Uncategorized</MenuCategory>
      <Position>30</Position>
    </Report>
    <Report instance="ff-20160930.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R31.htm</HtmlFileName>
      <LongName>030 - Disclosure - Note 1 - Nature of Operations and Basis of Presentation (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.futurefuelcorporation.com/20160930/role/statement-note-1-nature-of-operations-and-basis-of-presentation-details-textual</Role>
      <ShortName>Note 1 - Nature of Operations and Basis of Presentation (Details Textual)</ShortName>
      <MenuCategory>Uncategorized</MenuCategory>
      <Position>31</Position>
    </Report>
    <Report instance="ff-20160930.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R32.htm</HtmlFileName>
      <LongName>031 - Disclosure - Note 2 - Inventory (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.futurefuelcorporation.com/20160930/role/statement-note-2-inventory-details-textual</Role>
      <ShortName>Note 2 - Inventory (Details Textual)</ShortName>
      <MenuCategory>Uncategorized</MenuCategory>
      <Position>32</Position>
    </Report>
    <Report instance="ff-20160930.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R33.htm</HtmlFileName>
      <LongName>032 - Disclosure - Note 2 - Inventory - Carrying Values of Inventory (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.futurefuelcorporation.com/20160930/role/statement-note-2-inventory-carrying-values-of-inventory-details</Role>
      <ShortName>Note 2 - Inventory - Carrying Values of Inventory (Details)</ShortName>
      <MenuCategory>Uncategorized</MenuCategory>
      <Position>33</Position>
    </Report>
    <Report instance="ff-20160930.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R34.htm</HtmlFileName>
      <LongName>033 - Disclosure - Note 3 - Derivative Instruments (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.futurefuelcorporation.com/20160930/role/statement-note-3-derivative-instruments-details-textual</Role>
      <ShortName>Note 3 - Derivative Instruments (Details Textual)</ShortName>
      <MenuCategory>Uncategorized</MenuCategory>
      <Position>34</Position>
    </Report>
    <Report instance="ff-20160930.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R35.htm</HtmlFileName>
      <LongName>034 - Disclosure - Note 3 - Derivative Instruments - Carrying Value of Derivative Instruments (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.futurefuelcorporation.com/20160930/role/statement-note-3-derivative-instruments-carrying-value-of-derivative-instruments-details</Role>
      <ShortName>Note 3 - Derivative Instruments - Carrying Value of Derivative Instruments (Details)</ShortName>
      <MenuCategory>Uncategorized</MenuCategory>
      <Position>35</Position>
    </Report>
    <Report instance="ff-20160930.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R36.htm</HtmlFileName>
      <LongName>035 - Disclosure - Note 4 - Marketable Securities (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.futurefuelcorporation.com/20160930/role/statement-note-4-marketable-securities-details-textual</Role>
      <ShortName>Note 4 - Marketable Securities (Details Textual)</ShortName>
      <MenuCategory>Uncategorized</MenuCategory>
      <Position>36</Position>
    </Report>
    <Report instance="ff-20160930.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R37.htm</HtmlFileName>
      <LongName>036 - Disclosure - Note 4 - Marketable Securities - Marketable Securities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.futurefuelcorporation.com/20160930/role/statement-note-4-marketable-securities-marketable-securities-details</Role>
      <ShortName>Note 4 - Marketable Securities - Marketable Securities (Details)</ShortName>
      <MenuCategory>Uncategorized</MenuCategory>
      <Position>37</Position>
    </Report>
    <Report instance="ff-20160930.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R38.htm</HtmlFileName>
      <LongName>037 - Disclosure - Note 5 - Accrued Expenses and Other Current Liabilities - Accrued Expenses and Other Current Liabilities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.futurefuelcorporation.com/20160930/role/statement-note-5-accrued-expenses-and-other-current-liabilities-accrued-expenses-and-other-current-liabilities-details</Role>
      <ShortName>Note 5 - Accrued Expenses and Other Current Liabilities - Accrued Expenses and Other Current Liabilities (Details)</ShortName>
      <MenuCategory>Uncategorized</MenuCategory>
      <Position>38</Position>
    </Report>
    <Report instance="ff-20160930.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R39.htm</HtmlFileName>
      <LongName>038 - Disclosure - Note 6 - Borrowings (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.futurefuelcorporation.com/20160930/role/statement-note-6-borrowings-details-textual</Role>
      <ShortName>Note 6 - Borrowings (Details Textual)</ShortName>
      <MenuCategory>Uncategorized</MenuCategory>
      <Position>39</Position>
    </Report>
    <Report instance="ff-20160930.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R40.htm</HtmlFileName>
      <LongName>039 - Disclosure - Note 6 - Borrowings - Leverage Ratio (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.futurefuelcorporation.com/20160930/role/statement-note-6-borrowings-leverage-ratio-details</Role>
      <ShortName>Note 6 - Borrowings - Leverage Ratio (Details)</ShortName>
      <MenuCategory>Uncategorized</MenuCategory>
      <Position>40</Position>
    </Report>
    <Report instance="ff-20160930.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R41.htm</HtmlFileName>
      <LongName>040 - Disclosure - Note 7 - Provision for Income Taxes (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.futurefuelcorporation.com/20160930/role/statement-note-7-provision-for-income-taxes-details-textual</Role>
      <ShortName>Note 7 - Provision for Income Taxes (Details Textual)</ShortName>
      <MenuCategory>Uncategorized</MenuCategory>
      <Position>41</Position>
    </Report>
    <Report instance="ff-20160930.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R42.htm</HtmlFileName>
      <LongName>041 - Disclosure - Note 7 - Provision for Income Taxes - Summary of Provisions for Income Taxes (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.futurefuelcorporation.com/20160930/role/statement-note-7-provision-for-income-taxes-summary-of-provisions-for-income-taxes-details</Role>
      <ShortName>Note 7 - Provision for Income Taxes - Summary of Provisions for Income Taxes (Details)</ShortName>
      <MenuCategory>Uncategorized</MenuCategory>
      <Position>42</Position>
    </Report>
    <Report instance="ff-20160930.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R43.htm</HtmlFileName>
      <LongName>042 - Disclosure - Note 8 - Earnings Per Share (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.futurefuelcorporation.com/20160930/role/statement-note-8-earnings-per-share-details-textual</Role>
      <ShortName>Note 8 - Earnings Per Share (Details Textual)</ShortName>
      <MenuCategory>Uncategorized</MenuCategory>
      <Position>43</Position>
    </Report>
    <Report instance="ff-20160930.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R44.htm</HtmlFileName>
      <LongName>043 - Disclosure - Note 8 - Earnings Per Share - Computation of Basic and Diluted Earnings Per Common Share (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.futurefuelcorporation.com/20160930/role/statement-note-8-earnings-per-share-computation-of-basic-and-diluted-earnings-per-common-share-details</Role>
      <ShortName>Note 8 - Earnings Per Share - Computation of Basic and Diluted Earnings Per Common Share (Details)</ShortName>
      <MenuCategory>Uncategorized</MenuCategory>
      <Position>44</Position>
    </Report>
    <Report instance="ff-20160930.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R45.htm</HtmlFileName>
      <LongName>044 - Disclosure - Note 9 - Segment Information (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.futurefuelcorporation.com/20160930/role/statement-note-9-segment-information-details-textual</Role>
      <ShortName>Note 9 - Segment Information (Details Textual)</ShortName>
      <MenuCategory>Uncategorized</MenuCategory>
      <Position>45</Position>
    </Report>
    <Report instance="ff-20160930.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R46.htm</HtmlFileName>
      <LongName>045 - Disclosure - Note 9 - Segment Information - Revenues by Geographical Areas (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.futurefuelcorporation.com/20160930/role/statement-note-9-segment-information-revenues-by-geographical-areas-details</Role>
      <ShortName>Note 9 - Segment Information - Revenues by Geographical Areas (Details)</ShortName>
      <MenuCategory>Uncategorized</MenuCategory>
      <Position>46</Position>
    </Report>
    <Report instance="ff-20160930.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R47.htm</HtmlFileName>
      <LongName>046 - Disclosure - Note 9 - Segment Information - Summary of Business by Segment (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.futurefuelcorporation.com/20160930/role/statement-note-9-segment-information-summary-of-business-by-segment-details</Role>
      <ShortName>Note 9 - Segment Information - Summary of Business by Segment (Details)</ShortName>
      <MenuCategory>Uncategorized</MenuCategory>
      <Position>47</Position>
    </Report>
    <Report instance="ff-20160930.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R48.htm</HtmlFileName>
      <LongName>047 - Disclosure - Note 10 - Fair Value Measurements - Assets and Liiabilities Measured at Fair Value on Recurring Basis (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.futurefuelcorporation.com/20160930/role/statement-note-10-fair-value-measurements-assets-and-liiabilities-measured-at-fair-value-on-recurring-basis-details</Role>
      <ShortName>Note 10 - Fair Value Measurements - Assets and Liiabilities Measured at Fair Value on Recurring Basis (Details)</ShortName>
      <MenuCategory>Uncategorized</MenuCategory>
      <Position>48</Position>
    </Report>
    <Report instance="ff-20160930.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R49.htm</HtmlFileName>
      <LongName>048 - Disclosure - Note 11 - Reclassifications from Accumulated Other Comprehensive Income - Changes in Accumulated Other Comprehensive Income (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.futurefuelcorporation.com/20160930/role/statement-note-11-reclassifications-from-accumulated-other-comprehensive-income-changes-in-accumulated-other-comprehensive-income-details</Role>
      <ShortName>Note 11 - Reclassifications from Accumulated Other Comprehensive Income - Changes in Accumulated Other Comprehensive Income (Details)</ShortName>
      <MenuCategory>Uncategorized</MenuCategory>
      <Position>49</Position>
    </Report>
    <Report instance="ff-20160930.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R50.htm</HtmlFileName>
      <LongName>049 - Disclosure - Note 11 - Reclassifications from Accumulated Other Comprehensive Income - Reclassifications from Accumulated Other Comprehensive Income (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.futurefuelcorporation.com/20160930/role/statement-note-11-reclassifications-from-accumulated-other-comprehensive-income-reclassifications-from-accumulated-other-comprehensive-income-details</Role>
      <ShortName>Note 11 - Reclassifications from Accumulated Other Comprehensive Income - Reclassifications from Accumulated Other Comprehensive Income (Details)</ShortName>
      <MenuCategory>Uncategorized</MenuCategory>
      <Position>50</Position>
    </Report>
    <Report instance="ff-20160930.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R51.htm</HtmlFileName>
      <LongName>050 - Disclosure - Note 14 - Intangible Asset (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.futurefuelcorporation.com/20160930/role/statement-note-14-intangible-asset-details-textual</Role>
      <ShortName>Note 14 - Intangible Asset (Details Textual)</ShortName>
      <MenuCategory>Uncategorized</MenuCategory>
      <Position>51</Position>
    </Report>
    <Report instance="ff-20160930.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R52.htm</HtmlFileName>
      <LongName>051 - Disclosure - Note 15 - Recently Issued Accounting Statements (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.futurefuelcorporation.com/20160930/role/statement-note-15-recently-issued-accounting-statements-details-textual</Role>
      <ShortName>Note 15 - Recently Issued Accounting Statements (Details Textual)</ShortName>
      <MenuCategory>Uncategorized</MenuCategory>
      <Position>52</Position>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <LongName>All Reports</LongName>
      <ReportType>Book</ReportType>
      <ShortName>All Reports</ShortName>
    </Report>
  </MyReports>
  <InputFiles>
    <File>ff-20160930.xml</File>
    <File>ff-20160930.xsd</File>
    <File>ff-20160930_cal.xml</File>
    <File>ff-20160930_def.xml</File>
    <File>ff-20160930_lab.xml</File>
    <File>ff-20160930_pre.xml</File>
  </InputFiles>
  <SupplementalFiles/>
  <BaseTaxonomies/>
  <HasPresentationLinkbase>true</HasPresentationLinkbase>
  <HasCalculationLinkbase>true</HasCalculationLinkbase>
</FilingSummary>
