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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)