Note 2 - Significant Accounting Policies (Details)
$ in Thousands |
12 Months Ended |
|
Dec. 31, 2015
USD ($)
|
Dec. 31, 2014
USD ($)
|
Dec. 31, 2013
USD ($)
|
| Note 2 - Significant Accounting Policies (Details) [Line Items] |
|
|
|
| Sales Revenue, Goods, Net |
$ 299,611
|
$ 341,838
|
$ 444,919
|
| Revenue from Related Parties |
64,981
|
39,090
|
9,420
|
| Derivative Assets (Liabilities), at Fair Value, Net |
3,362
|
68
|
|
| Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent |
(2,204)
|
(3,177)
|
4,839
|
| Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Tax |
(1,314)
|
(1,980)
|
3,018
|
| Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax |
394
|
0
|
207
|
| Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax |
$ 212
|
|
129
|
| Number of Reportable Segments |
2
|
|
|
| Bleach Activator [Member] |
|
|
|
| Note 2 - Significant Accounting Policies (Details) [Line Items] |
|
|
|
| Sales Revenue, Goods, Net |
|
43,927
|
56,596
|
| Biodiesel [Member] |
|
|
|
| Note 2 - Significant Accounting Policies (Details) [Line Items] |
|
|
|
| Sales Revenue, Goods, Net |
$ 33,255
|
62,994
|
135,273
|
| Bill and Hold Arrangements [Member] |
|
|
|
| Note 2 - Significant Accounting Policies (Details) [Line Items] |
|
|
|
| Sales Revenue, Goods, Net |
$ 28,740
|
$ 31,598
|
44,047
|
| Commodity Option [Member] |
|
|
|
| Note 2 - Significant Accounting Policies (Details) [Line Items] |
|
|
|
| Derivative Liability, Number of Instruments Held |
200
|
350
|
|
| Derivative Asset, Fair Value, Gross Liability |
$ 427
|
$ 794
|
|
| Commodity Option [Member] | Short [Member] |
|
|
|
| Note 2 - Significant Accounting Policies (Details) [Line Items] |
|
|
|
| Derivative Liability, Number of Instruments Held |
200
|
|
|
| Derivative Asset, Fair Value, Gross Liability |
$ 427
|
$ 794
|
|
| Derivative Asset, Number of Instruments Held |
|
225
|
|
| Future [Member] |
|
|
|
| Note 2 - Significant Accounting Policies (Details) [Line Items] |
|
|
|
| Derivative Asset, Number of Instruments Held |
631
|
225
|
|
| Derivative Asset, Fair Value, Gross Asset |
$ 3,789
|
$ 862
|
|
| Future [Member] | Short [Member] |
|
|
|
| Note 2 - Significant Accounting Policies (Details) [Line Items] |
|
|
|
| Derivative Liability, Number of Instruments Held |
|
350
|
|
| Derivative Asset, Number of Instruments Held |
631
|
|
|
| Derivative Asset, Fair Value, Gross Asset |
$ 3,789
|
$ 862
|
|
| Environmental Assets [Member] |
|
|
|
| Note 2 - Significant Accounting Policies (Details) [Line Items] |
|
|
|
| Property, Plant and Equipment, Useful Life |
35 years
|
|
|
| Affiliated Entity [Member] |
|
|
|
| Note 2 - Significant Accounting Policies (Details) [Line Items] |
|
|
|
| Revenue from Related Parties |
$ 64,981
|
39,090
|
9,420
|
| Affiliated Entity [Member] | Biodeisel, Petrodiesel, Blends and Other Petroleum Products [Member] |
|
|
|
| Note 2 - Significant Accounting Policies (Details) [Line Items] |
|
|
|
| Revenue from Related Parties |
$ 64,981
|
$ 39,090
|
$ 9,420
|