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Note 11 - Segment Information and Foreign Operations - Reporting of Segment Revenue by Product Type (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Revenue $ 27,955 $ 23,645 $ 65,285 $ 74,256
Substrates [Member]        
Revenue 21,259 15,007 43,633 51,655
Raw Materials and Other [Member]        
Revenue $ 6,696 $ 8,638 $ 21,652 $ 22,601