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Note 9 - Segment Information (Details) - Summary of Business by Segment (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013
Segment Reporting Information [Line Items] |  |  |  |
Total Revenues | $ 68,039 | $ 106,063 | $ 150,236 | $ 198,228
Segment gross margins | 6,578 | 27,626 | 16,180 | 49,007
Income before interest and taxes | 4,171 | 24,975 | 11,622 | 43,925
Interest and other income | 4,516 | 3,719 | 7,003 | 4,931
Interest and other expense | (71) | (40) | (13) | (46)
Provision for income taxes | (3,269) | (10,498) | (6,991) | (16,604)
Net income | 5,347 | 18,156 | 11,621 | 32,206
Operating Segments [Member] | Chemicals [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total Revenues | 32,609 | 42,026 | 62,885 | 82,162
Segment gross margins | 7,131 | 14,784 | 16,165 | 27,850
Operating Segments [Member] | Biofuels [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total Revenues | 35,430 | 64,037 | 87,351 | 116,066
Segment gross margins | (553) | 12,842 | 15 | 21,157
Corporate, Non-Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Corporate expenses | $ (2,407) | $ (2,651) | $ (4,558) | $ (5,082)

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