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Note 9 - Segment Information (Tables)
6 Months Ended
Jun. 30, 2016
Notes Tables  
Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area [Table Text Block]
   
Three months ended June 30:
   
Six months ended June 30:
 
   
2016
   
2015
   
2016
   
2015
 
United States
  $ 67,209     $ 104,157     $ 113,215     $ 157,734  
All Foreign Countries
    670       441       1,299       951  
Total
  $ 67,879     $ 104,598     $ 114,514     $ 158,685  
Schedule of Segment Reporting Information, by Segment [Table Text Block]
   
Three months ended June 30:
   
Six months ended June 30:
 
   
2016
   
2015
   
2016
   
2015
 
Revenue
                               
Custom chemicals
  $ 19,401     $ 28,158     $ 39,693     $ 57,956  
Performance chemicals
    5,162       4,530       9,938       8,938  
Chemicals revenue
    24,563       32,688       49,631       66,894  
Biofuels revenue
    43,316       71,910       64,883       91,791  
Total Revenue
  $ 67,879     $ 104,598     $ 114,514     $ 158,685  
                                 
Segment gross profit
                               
Chemicals
  $ 6,297     $ 10,012     $ 14,869     $ 20,865  
Biofuels
    1,675       (4,468 )     4,156       (2,007 )
Total gross profit
    7,972       5,544       19,025       18,858  
Corporate expenses
    (2,596 )     (2,367 )     (5,120 )     (4,904 )
Income before interest and taxes
    5,376       3,177       13,905       13,954  
Interest and other income
    1,464       1,856       2,809       4,143  
Interest and other expense
    467       (121 )     (710 )     (171 )
Benefit/(provision) for income taxes
    6,917       (1,119 )     8,789       (6,002 )
Net income
  $ 14,224     $ 3,793     $ 24,793     $ 11,924