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Note 9 - Segment Information (Details) - Summary of Business by Segment (USD $) In Thousands, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2014 | Mar. 31, 2013
Segment Reporting Information [Line Items] |  |
Total Revenues | $ 82,197 | $ 92,165
Segment gross margins | 9,602 | 21,381
Income before interest and taxes | 7,451 | 18,950
Interest and other income | 2,551 | 1,212
Interest and other expense | (6) | (6)
Provision for income taxes | (3,722) | (6,106)
Net income | 6,274 | 14,050
Operating Segments [Member] | Chemicals [Member] |  |
Segment Reporting Information [Line Items] |  |
Total Revenues | 30,276 | 40,136
Segment gross margins | 9,034 | 13,066
Operating Segments [Member] | Biofuels [Member] |  |
Segment Reporting Information [Line Items] |  |
Total Revenues | 51,921 | 52,029
Segment gross margins | 568 | 8,315
Corporate, Non-Segment [Member] |  |
Segment Reporting Information [Line Items] |  |
Corporate expenses | $ (2,151) | $ (2,431)

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