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Note 11 - Segment Information and Foreign Operations - Segment Revenue Reporting by Geographic Region (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
CHINA        
Revenue 13,145 13,807 41,063 42,271
TAIWAN        
Revenue 9,045 2,140 10,796 10,142
JAPAN        
Revenue 1,854 1,623 3,276 3,409
Asia Pacific Excluding China, Taiwan and Japan [Member]        
Revenue 347 797 1,555 2,307
Europe [Member]        
Revenue 3,424 2,720 7,122 11,134
North America [Member]        
Revenue $ 140 $ 2,558 $ 1,473 $ 4,993