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Note 3 - Revenue Recognition 1 (Details Textual) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Increase (Decrease) in Contract with Customer, Liability $ (569) $ 925  
Contract with Customer, Liability, Revenue Recognized 723 1,327  
Accounts Receivable, Blenders' Tax Credit 11,276   $ 8,300
Accounts Receivable, Allowance for Credit Loss, Ending Balance 112   63
Bill and Hold Inventory Invoiced, but not Shipped [Member]      
Contract with Customer, Liability, Total 2,911   $ 173
Chemicals [Member]      
Increase (Decrease) in Contract with Customer, Liability $ 209 $ 2,307