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Note 13 - Segment Information - Summary of Business by Segment (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Revenue from Contract with Customer $ 42,261 $ 41,516
Gross profit (7,155) (10,736)
Operating Segments [Member] | Chemicals [Member]    
Revenue from Contract with Customer 21,561 16,110
Gross profit 5,418 (1,301)
Operating Segments [Member] | Chemicals [Member] | Custom Chemicals [Member]    
Revenue from Contract with Customer 15,715 10,675
Operating Segments [Member] | Chemicals [Member] | Performance Chemicals [Member]    
Revenue from Contract with Customer 5,846 5,435
Operating Segments [Member] | Biofuels [Member]    
Revenue from Contract with Customer 20,700 25,406
Gross profit $ (12,573) $ (9,435)