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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)

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