<?xml version="1.0" encoding="us-ascii"?><InstanceReport xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema"><Version>2.2.0.25</Version><hasSegments>false</hasSegments><hasScenarios>false</hasScenarios><ReportLongName>00640 - Disclosure - Inventories (Tables)</ReportLongName><DisplayLabelColumn>true</DisplayLabelColumn><ShowElementNames>false</ShowElementNames><RoundingOption /><HasEmbeddedReports>false</HasEmbeddedReports><Columns><Column><Id>1</Id><IsAbstractGroupTitle>false</IsAbstractGroupTitle><LabelColumn>false</LabelColumn><CurrencyCode>USD</CurrencyCode><FootnoteIndexer /><hasSegments>false</hasSegments><hasScenarios>false</hasScenarios><MCU><KeyName>1/1/2011 - 3/31/2011
USD ($)

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Inventories &lt;/font&gt;&lt;/td&gt;&lt;td   style="width: 15px; text-align:right;border-color:#000000;min-width:15px;"&gt;&amp;#160;&lt;/td&gt;&lt;td   style="width: 87px; text-align:left;border-color:#000000;min-width:87px;"&gt;&amp;#160;&lt;/td&gt;&lt;td   style="width: 15px; text-align:right;border-color:#000000;min-width:15px;"&gt;&amp;#160;&lt;/td&gt;&lt;td   style="width: 87px; text-align:left;border-color:#000000;min-width:87px;"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&lt;tr style="height: 16px"&gt;&lt;td   style="width: 70px; text-align:left;border-color:#000000;min-width:70px;"&gt;&amp;#160;&lt;/td&gt;&lt;td   style="width: 325px; text-align:left;border-color:#000000;min-width:325px;"&gt;&amp;#160;&lt;/td&gt;&lt;td   style="width: 15px; text-align:right;border-color:#000000;min-width:15px;"&gt;&amp;#160;&lt;/td&gt;&lt;td   style="width: 87px; text-align:center;border-color:#000000;min-width:87px;"&gt;&lt;font style="FONT-WEIGHT: bold;FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #ff0000;TEXT-ALIGN: center;"&gt;March 31,&lt;/font&gt;&lt;/td&gt;&lt;td   style="width: 15px; text-align:right;border-color:#000000;min-width:15px;"&gt;&amp;#160;&lt;/td&gt;&lt;td   style="width: 87px; text-align:center;border-color:#000000;min-width:87px;"&gt;&lt;font style="FONT-WEIGHT: bold;FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #ff0000;TEXT-ALIGN: center;"&gt;December 31,&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;&lt;tr style="height: 16px"&gt;&lt;td   style="width: 70px; text-align:left;border-color:#000000;min-width:70px;"&gt;&amp;#160;&lt;/td&gt;&lt;td   style="width: 325px; text-align:left;border-color:#000000;min-width:325px;"&gt;&amp;#160;&lt;/td&gt;&lt;td   style="width: 15px; text-align:right;border-color:#000000;min-width:15px;"&gt;&amp;#160;&lt;/td&gt;&lt;td   style="width: 87px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:87px;"&gt;&lt;font style="FONT-WEIGHT: bold;FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #ff0000;TEXT-ALIGN: center;"&gt;2011&lt;/font&gt;&lt;/td&gt;&lt;td   style="width: 15px; text-align:right;border-color:#000000;min-width:15px;"&gt;&amp;#160;&lt;/td&gt;&lt;td   style="width: 87px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:87px;"&gt;&lt;font style="FONT-WEIGHT: bold;FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #ff0000;TEXT-ALIGN: center;"&gt;2010&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;&lt;tr style="height: 5px"&gt;&lt;td   style="width: 70px; text-align:left;border-color:#000000;min-width:70px;"&gt;&amp;#160;&lt;/td&gt;&lt;td   style="width: 325px; text-align:left;border-color:#000000;min-width:325px;"&gt;&amp;#160;&lt;/td&gt;&lt;td   style="width: 15px; text-align:right;border-color:#000000;min-width:15px;"&gt;&amp;#160;&lt;/td&gt;&lt;td   style="width: 87px; border-top-style:solid;border-top-width:1px;text-align:left;border-color:#000000;min-width:87px;"&gt;&amp;#160;&lt;/td&gt;&lt;td   style="width: 15px; text-align:right;border-color:#000000;min-width:15px;"&gt;&amp;#160;&lt;/td&gt;&lt;td   style="width: 87px; border-top-style:solid;border-top-width:1px;text-align:left;border-color:#000000;min-width:87px;"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&lt;tr style="height: 16px"&gt;&lt;td   style="width: 70px; text-align:left;border-color:#000000;min-width:70px;"&gt;&amp;#160;&lt;/td&gt;&lt;td   style="width: 325px; text-align:left;border-color:#000000;min-width:325px;"&gt;&lt;font style="FONT-FAMILY: Arial;FONT-SIZE: 10pt;COLOR: #000000;"&gt;Raw materials&lt;/font&gt;&lt;/td&gt;&lt;td   style="width: 15px; text-align:right;border-color:#000000;min-width:15px;"&gt;&lt;font style="FONT-FAMILY: Arial;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: right;"&gt;$&lt;/font&gt;&lt;/td&gt;&lt;td   style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"&gt;&lt;font style="FONT-FAMILY: Arial;FONT-SIZE: 10pt;COLOR: #000000;"&gt; 1,303&lt;/font&gt;&lt;/td&gt;&lt;td   style="width: 15px; text-align:right;border-color:#000000;min-width:15px;"&gt;&lt;font style="FONT-FAMILY: Arial;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: right;"&gt;$&lt;/font&gt;&lt;/td&gt;&lt;td   style="width: 87px; text-align:right;background-color:#00FFFF;border-color:#000000;min-width:87px;"&gt;&lt;font style="FONT-FAMILY: Arial;FONT-SIZE: 10pt;COLOR: #000000;"&gt; 1,158&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;&lt;tr style="height: 16px"&gt;&lt;td   style="width: 70px; text-align:left;border-color:#000000;min-width:70px;"&gt;&amp;#160;&lt;/td&gt;&lt;td   style="width: 325px; text-align:left;border-color:#000000;min-width:325px;"&gt;&lt;font style="FONT-FAMILY: Arial;FONT-SIZE: 10pt;COLOR: #000000;"&gt;Work in process&lt;/font&gt;&lt;/td&gt;&lt;td   style="width: 15px; text-align:right;border-color:#000000;min-width:15px;"&gt;&amp;#160;&lt;/td&gt;&lt;td   style="width: 87px; text-align:right;border-color:#000000;min-width:87px;"&gt;&lt;font style="FONT-FAMILY: Arial;FONT-SIZE: 10pt;COLOR: #000000;"&gt; 858&lt;/font&gt;&lt;/td&gt;&lt;td   style="width: 15px; text-align:right;border-color:#000000;min-width:15px;"&gt;&amp;#160;&lt;/td&gt;&lt;td   style="width: 87px; text-align:right;background-color:#00FFFF;border-color:#000000;min-width:87px;"&gt;&lt;font style="FONT-FAMILY: Arial;FONT-SIZE: 10pt;COLOR: #000000;"&gt; 810&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;&lt;tr style="height: 16px"&gt;&lt;td   style="width: 70px; text-align:left;border-color:#000000;min-width:70px;"&gt;&amp;#160;&lt;/td&gt;&lt;td   style="width: 325px; text-align:left;border-color:#000000;min-width:325px;"&gt;&lt;font style="FONT-FAMILY: Arial;FONT-SIZE: 10pt;COLOR: #000000;"&gt;Finished products&lt;/font&gt;&lt;/td&gt;&lt;td   style="width: 15px; text-align:right;border-color:#000000;min-width:15px;"&gt;&amp;#160;&lt;/td&gt;&lt;td   style="width: 87px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:87px;"&gt;&lt;font style="FONT-FAMILY: Arial;FONT-SIZE: 10pt;COLOR: #000000;"&gt; 2,298&lt;/font&gt;&lt;/td&gt;&lt;td   style="width: 15px; text-align:right;border-color:#000000;min-width:15px;"&gt;&amp;#160;&lt;/td&gt;&lt;td   style="width: 87px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;background-color:#00FFFF;border-color:#000000;min-width:87px;"&gt;&lt;font style="FONT-FAMILY: Arial;FONT-SIZE: 10pt;COLOR: #000000;"&gt; 2,144&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;&lt;tr style="height: 16px"&gt;&lt;td   style="width: 70px; text-align:left;border-color:#000000;min-width:70px;"&gt;&amp;#160;&lt;/td&gt;&lt;td   style="width: 325px; text-align:left;border-color:#000000;min-width:325px;"&gt;&amp;#160;&lt;/td&gt;&lt;td   style="width: 15px; text-align:right;border-color:#000000;min-width:15px;"&gt;&amp;#160;&lt;/td&gt;&lt;td   style="width: 87px; border-top-style:solid;border-top-width:1px;text-align:right;border-color:#000000;min-width:87px;"&gt;&lt;font style="FONT-FAMILY: Arial;FONT-SIZE: 10pt;COLOR: #000000;"&gt; 4,459&lt;/font&gt;&lt;/td&gt;&lt;td   style="width: 15px; text-align:right;border-color:#000000;min-width:15px;"&gt;&amp;#160;&lt;/td&gt;&lt;td   style="width: 87px; border-top-style:solid;border-top-width:1px;text-align:right;background-color:#00FFFF;border-color:#000000;min-width:87px;"&gt;&lt;font style="FONT-FAMILY: Arial;FONT-SIZE: 10pt;COLOR: #000000;"&gt; 4,112&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;&lt;tr style="height: 16px"&gt;&lt;td   style="width: 70px; text-align:left;border-color:#000000;min-width:70px;"&gt;&amp;#160;&lt;/td&gt;&lt;td   style="width: 325px; text-align:left;border-color:#000000;min-width:325px;"&gt;&lt;font style="FONT-FAMILY: Arial;FONT-SIZE: 10pt;COLOR: #000000;"&gt;Reduction to LIFO cost basis&lt;/font&gt;&lt;/td&gt;&lt;td   style="width: 15px; text-align:right;border-color:#000000;min-width:15px;"&gt;&amp;#160;&lt;/td&gt;&lt;td   style="width: 87px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:87px;"&gt;&lt;font style="FONT-FAMILY: Arial;FONT-SIZE: 10pt;COLOR: #000000;"&gt; (169)&lt;/font&gt;&lt;/td&gt;&lt;td   style="width: 15px; text-align:right;border-color:#000000;min-width:15px;"&gt;&amp;#160;&lt;/td&gt;&lt;td   style="width: 87px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;background-color:#00FFFF;border-color:#000000;min-width:87px;"&gt;&lt;font style="FONT-FAMILY: Arial;FONT-SIZE: 10pt;COLOR: #000000;"&gt; (154)&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;&lt;tr style="height: 16px"&gt;&lt;td   style="width: 70px; text-align:left;border-color:#000000;min-width:70px;"&gt;&amp;#160;&lt;/td&gt;&lt;td   style="width: 325px; text-align:left;border-color:#000000;min-width:325px;"&gt;&amp;#160;&lt;/td&gt;&lt;td   style="width: 15px; text-align:right;border-color:#000000;min-width:15px;"&gt;&lt;font style="FONT-FAMILY: Arial;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: right;"&gt;$&lt;/font&gt;&lt;/td&gt;&lt;td   style="width: 87px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:87px;"&gt;&lt;font style="FONT-FAMILY: Arial;FONT-SIZE: 10pt;COLOR: #000080;"&gt; 4,290&lt;/font&gt;&lt;/td&gt;&lt;td   style="width: 15px; text-align:right;border-color:#000000;min-width:15px;"&gt;&lt;font style="FONT-FAMILY: Arial;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: right;"&gt;$&lt;/font&gt;&lt;/td&gt;&lt;td   style="width: 87px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:87px;"&gt;&lt;font style="FONT-FAMILY: Arial;FONT-SIZE: 10pt;COLOR: #000080;"&gt; 3,958&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;&lt;/div&gt;</NonNumbericText><NonNumericTextHeader>Note 7.  Inventories &amp;#160;&amp;#160;&amp;#160;&amp;#160;&amp;#160;&amp;#160;&amp;#160;March 31,&amp;#160;December</NonNumericTextHeader><FootnoteIndexer /><CurrencyCode /><CurrencySymbol /><IsIndependantCurrency>false</IsIndependantCurrency><ShowCurrencySymbol>false</ShowCurrencySymbol><DisplayDateInUSFormat>false</DisplayDateInUSFormat><hasSegments>false</hasSegments><hasScenarios>false</hasScenarios></Cell></Cells><OriginalInstanceReportColumns /><Unit>Other</Unit><ElementDataType>us-types:textBlockItemType</ElementDataType><SimpleDataType>string</SimpleDataType><ElementDefenition>Inventory Disclosure Table Text Block</ElementDefenition><ElementReferences>No authoritative reference available.</ElementReferences><IsTotalLabel>false</IsTotalLabel><IsEPS>false</IsEPS><Label>Inventories</Label></Row></Rows><Footnotes /><NumberOfCols>1</NumberOfCols><NumberOfRows>2</NumberOfRows><ReportName>Inventories (Tables)</ReportName><MonetaryRoundingLevel>UnKnown</MonetaryRoundingLevel><SharesRoundingLevel>UnKnown</SharesRoundingLevel><PerShareRoundingLevel>UnKnown</PerShareRoundingLevel><ExchangeRateRoundingLevel>UnKnown</ExchangeRateRoundingLevel><HasCustomUnits>false</HasCustomUnits><SharesShouldBeRounded>true</SharesShouldBeRounded></InstanceReport>
