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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)