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Note 17 - Business Segments - Summary of Business Segment Information (Details) - USD ($)
$ in Thousands
 12 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Revenue from Contract with Customer, Including Assessed Tax $ 36,473 $ 42,312
Gross Profit / (Loss) 9,144 10,762
Operating Income / (Loss) 254 1,093
Total Assets 41,068 42,540
Depreciation, Depletion and Amortization, Nonproduction 2,741 4,341
Capital Expenditures 967 542
Operating Segments [Member] | Semiconductor Back-end Solutions [Member]    
Revenue from Contract with Customer, Including Assessed Tax 24,682 30,111
Gross Profit / (Loss) 6,766 8,376
Operating Income / (Loss) 411 1,095
Total Assets 23,114 23,418
Depreciation, Depletion and Amortization, Nonproduction 2,437 4,056
Capital Expenditures 867 542
Operating Segments [Member] | Industrial Electronics [Member]    
Revenue from Contract with Customer, Including Assessed Tax 11,756 12,176
Gross Profit / (Loss) 2,412 2,432
Operating Income / (Loss) 236 509
Total Assets 6,659 6,439
Depreciation, Depletion and Amortization, Nonproduction 236 210
Capital Expenditures 100 0
Segment Reporting, Reconciling Item, Corporate Nonsegment [Member]    
Revenue from Contract with Customer, Including Assessed Tax 35 25
Gross Profit / (Loss) (34) (46)
Operating Income / (Loss) (393) (511)
Total Assets 11,295 12,683
Depreciation, Depletion and Amortization, Nonproduction 68 75
Capital Expenditures $ 0 $ 0