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Note 13 - Segment Information - Summary of Business by Segment (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Revenue from Contract with Customer $ 116,752 $ 118,141 $ 276,241 $ 278,198
Gross profit 3,870 19,985 16,901 13,807
Operating Segments [Member] | Chemicals [Member]        
Revenue from Contract with Customer 17,847 21,506 58,484 61,261
Gross profit 6,878 8,362 21,917 17,976
Operating Segments [Member] | Chemicals [Member] | Custom Chemicals [Member]        
Revenue from Contract with Customer 14,454 16,047 46,650 44,028
Operating Segments [Member] | Chemicals [Member] | Performance Chemicals [Member]        
Revenue from Contract with Customer 3,393 5,459 11,834 17,233
Operating Segments [Member] | Biofuels [Member]        
Revenue from Contract with Customer 98,905 96,635 217,757 216,937
Gross profit $ (3,008) $ 11,623 $ (5,016) $ (4,169)