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Note 11 - Segment Information - Summary of Business by Segment (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Revenue from Contract with Customer | $ 22,689 | $ 51,140 | $ 75,900 | $ 181,830
Segment gross loss | (6,831) | 383 | (30,161) | 14,047
Selling, general, and administrative expenses | 2,049 | 2,290 | 7,161 | 6,483
Research and development expenses | 855 | 981 | 3,179 | 2,803
Other income, net | 381 | 1,690 | 3,129 | 8,580
Net loss before income taxes | (9,354) | (1,198) | (37,372) | 13,341
Other income, net | (381) | (1,690) | (3,129) | (8,580)
Operating Segments [Member] |  |  |  |
Revenue from Contract with Customer | 22,689 | 51,140 | 75,900 | 181,830
Cost of goods sold | 28,949 | 50,188 | 104,273 | 165,707
Distribution | 571 | 569 | 1,788 | 2,076
Segment gross loss | (6,831) | 383 | (30,161) |
Chemicals [Member] | Operating Segments [Member] |  |  |  |
Revenue from Contract with Customer | 15,578 | 17,928 | 41,562 | 55,223
Cost of goods sold | 19,699 | 14,357 | 49,212 | 42,549
Distribution | 291 | 164 | 825 | 569
Segment gross loss | (4,412) | 3,407 | (8,475) | 12,105
Biofuels [Member] | Operating Segments [Member] |  |  |  |
Revenue from Contract with Customer | 7,111 | 33,212 | 34,338 | 126,607
Cost of goods sold | 9,250 | 35,831 | 55,061 | 123,158
Distribution | 280 | 405 | 963 | 1,507
Segment gross loss | $ (2,419) | $ (3,024) | $ (21,686) | $ 1,942

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