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Note 3 - Revenue Recognition 1 (Details Textual) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Increase (Decrease) in Contract with Customer, Liability $ (2,269) $ (569)  
Contract with Customer, Liability, Revenue Recognized 2,213 723  
Accounts Receivable, Blenders' Tax Credit 5,550   $ 8,232
Accounts Receivable, Allowance for Credit Loss, Ending Balance 55   $ 67
Bill and Hold Arrangements [Member]      
Contract with Customer, Liability, Total 2,743 2,911  
Bill and Hold Inventory [Member] | Bill and Hold Inventory Invoiced, but not Shipped [Member]      
Contract with Customer, Liability, Total 572    
Chemicals [Member]      
Increase (Decrease) in Contract with Customer, Liability $ 0 $ 209