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Note 12 - Segment Information - Summary of Business by Segment (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Revenue from Contract with Customer	$ 51,140	$ 116,752	$ 181,830	$ 276,241
Gross profit	383	3,870	14,047	16,901
Operating expenses	3,271	3,573	9,286	9,936
(Loss) income from operations	(2,888)	297	4,761	6,965
Other income, net	1,690	2,491	8,580	7,067
(Loss) income before taxes	(1,198)	2,788	13,341	14,032
Operating Segments [Member] | Chemicals [Member]
Revenue from Contract with Customer	17,928	17,847	55,223	58,484
Gross profit	3,407	6,878	12,105	21,917
Operating Segments [Member] | Chemicals [Member] | Custom Chemicals [Member]
Revenue from Contract with Customer	15,323	14,454	46,333	46,650
Operating Segments [Member] | Chemicals [Member] | Performance Chemicals [Member]
Revenue from Contract with Customer	2,605	3,393	8,890	11,834
Operating Segments [Member] | Biofuels [Member]
Revenue from Contract with Customer	33,212	98,905	126,607	217,757
Gross profit	$ (3,024)	$ (3,008)	$ 1,942	$ (5,016)

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