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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