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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).

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