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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)

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