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Note 4 - Revenue Recognition 1 (Details Textual) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2023
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Dec. 31, 2022
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Increase (Decrease) in Contract with Customer, Liability                 $ (2,418) $ (4,055) $ (2,931)
Contract with Customer, Liability, Revenue Recognized                 2,734 5,816  
Accounts Receivable, Blenders' Tax Credit $ 11,381       $ 8,970       11,381 8,970  
Accounts Receivable, Allowance for Credit Loss 55       48       55 48  
Revenue from Contract with Customer, Excluding Assessed Tax 92,009 [1] $ 116,752 $ 85,308 $ 74,181 117,816 [1] $ 118,141 $ 117,796 $ 42,261 368,250 396,014 321,386
Bill and Hold Arrangements [Member] | Four Customers [Member]                      
Revenue from Contract with Customer, Excluding Assessed Tax                 43,766 36,805 34,695
Contract with Customer, Liability $ 4,317       $ 4,473       4,317 4,473 $ 3,154
Chemicals [Member]                      
Increase (Decrease) in Contract with Customer, Liability                 $ 538 $ 1,983  
[1] The fourth quarter of 2019 includes the retroactive reinstatement of the BTC in revenue and gross profit (see Note 3 for further information).