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Note 21 - Segment Information - Summary of Business by Segment (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2023 | [1] | Sep. 30, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Dec. 31, 2022 | [1] | Sep. 30, 2022 | Jun. 30, 2022 | Mar. 31, 2022 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Revenue from Contract with Customer, Excluding Assessed Tax | $ 92,009 | $ 116,752 | $ 85,308 | $ 74,181 | $ 117,816 | $ 118,141 | $ 117,796 | $ 42,261 | $ 368,250 | $ 396,014 | $ 321,386
Gross profit | $ 24,078 | $ 3,870 | $ (8,592) | $ 21,623 | $ 15,186 | $ 19,985 | $ 977 | $ (7,155) | 40,979 | 28,993 | 23,537
Operating Segments [Member] | Chemicals [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  |  |  |  |  |  |  |  | 79,333 | 80,893 | 67,542
Gross profit |  |  |  |  |  |  |  |  | 29,936 | 25,645 | 13,970
Operating Segments [Member] | Chemicals [Member] | Custom Chemicals [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  |  |  |  |  |  |  |  | 64,286 | 58,737 | 50,675
Operating Segments [Member] | Chemicals [Member] | Performance Chemicals [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  |  |  |  |  |  |  |  | 15,047 | 22,156 | 16,867
Operating Segments [Member] | Biofuels [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  |  |  |  |  |  |  |  | 288,917 | 315,121 | 253,844
Gross profit |  |  |  |  |  |  |  |  | $ 11,043 | $ 3,348 | $ 9,567
[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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