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Note 14 - Business Segments - Business Segment Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2025
Mar. 31, 2024
Jun. 30, 2024
Revenues $ 7,384 $ 10,398 $ 25,802 $ 32,566  
Gross Profit / (Loss) 1,976 2,703 6,516 8,077  
Operating Income / (Loss) (343) 59 (213) 735  
Total Assets 39,959 43,087 39,959 43,087 $ 42,540
Depreciation and Amortization 671 762 2,093 3,546  
Capital Expenditures 156 50 408 208  
Segment Reporting, Reconciling Item, Corporate Nonsegment [Member]          
Revenues 9 6 24 19  
Gross Profit / (Loss) (8) (10) (28) (33)  
Operating Income / (Loss) (340) (379) (454) (489)  
Total Assets 2,215 2,919 2,215 2,919  
Depreciation and Amortization 17 20 51 55  
Capital Expenditures 0 0 0 0  
Semiconductor Back-end Solutions [Member] | Operating Segments [Member]          
Revenues 5,425 7,697 18,113 22,769  
Gross Profit / (Loss) 1,436 2,220 4,972 6,082  
Operating Income / (Loss) (3) 412 271 714  
Total Assets 31,829 33,463 31,829 33,463  
Depreciation and Amortization 597 684 1,872 3,308  
Capital Expenditures 100 50 352 208  
Industrial Electronics [Member] | Operating Segments [Member]          
Revenues 1,950 2,695 7,665 9,778  
Gross Profit / (Loss) 548 493 1,572 2,028  
Operating Income / (Loss) 0 26 (30) 510  
Total Assets 5,915 6,705 5,915 6,705  
Depreciation and Amortization 57 58 170 183  
Capital Expenditures $ 56 $ 0 $ 56 $ 0