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Note 2 - Inventory (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Biofuels [Member]        
Inventory, LIFO Reserve, Effect on Income, Net $ 197 $ 260 $ (2,282) $ 344
Chemicals [Member]        
Inventory, LIFO Reserve, Effect on Income, Net 148 240 (1,042) 388
Inventory, LIFO Reserve, Period Charge $ (345) $ (500) $ 3,324 $ (732)