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Note 3 - Revenue Recognition 1 (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Increase (Decrease) in Contract with Customer, Liability     $ (2,030) $ (4,128)  
Contract with Customer, Liability, Revenue Recognized $ 444 $ 2,037 2,402 5,211  
Accounts Receivable, Blenders' Tax Credit 13,084   13,084   $ 8,970
Accounts Receivable, Allowance for Credit Loss 67   67   48
Bill and Hold Arrangements [Member] | Four Customers [Member]          
Contract with Customer, Liability 4,010   4,010   $ 4,473
Chemicals [Member]          
Increase (Decrease) in Contract with Customer, Liability $ 506 $ 733 $ 538 $ 733