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Note 14 - Business Segments - Business Segment Information (Details) - USD ($)
$ in Thousands
 3 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Jun. 30, 2025
Revenues $ 15,514 $ 9,799  
Gross Profit / (Loss) 2,585 2,322  
Operating Income / (Loss) 46 133  
Total Assets 47,378 42,940 $ 41,068
Depreciation and Amortization 532 711  
Capital Expenditures 46 133  
Segment Reporting, Reconciling Item, Corporate Nonsegment [Member]      
Revenues 10 6  
Gross Profit / (Loss) (7) (11)  
Operating Income / (Loss) (72) (37)  
Total Assets 10,234 10,378  
Depreciation and Amortization 17 17  
Capital Expenditures 0 0  
Semiconductor Back-end Solutions [Member] | Operating Segments [Member]      
Revenues 11,452 6,879  
Gross Profit / (Loss) 1,710 1,794  
Operating Income / (Loss) (80) 177  
Total Assets 29,712 26,265  
Depreciation and Amortization 455 636  
Capital Expenditures 38 133  
Industrial Electronics [Member] | Operating Segments [Member]      
Revenues 4,052 2,914  
Gross Profit / (Loss) 882 539  
Operating Income / (Loss) 198 (7)  
Total Assets 7,432 6,297  
Depreciation and Amortization 60 58  
Capital Expenditures $ 8 $ 0