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Note 6 - Investments in Privately-Held Raw Material Companies - Summary Information for Equity Method Investments (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Gross profit $ 11,242 $ 23,836 $ 13,318
Operating income (21,976) (14,803) (21,569)
Net income (23,202) (11,791) (19,193)
Parent Company [Member]      
Net revenue 10,342 11,715 10,033
Gross profit 2,272 5,374 3,365
Operating income 1,292 3,889 2,724
Net income 602 3,439 1,884
Five Minority Investments [Member]      
Net revenue 32,442 37,591 32,544
Gross profit 6,899 17,747 11,698
Operating income 4,139 13,780 10,115
Net income $ 2,179 $ 11,944 $ 8,681