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Note C - Property and Equipment (Details Textual) - USD ($)
12 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Depreciation $ 4,600,000 $ 4,600,000
Machinery and Equipment [Member]    
Property, Plant and Equipment, Disposals 3,945,000  
Accumulated Depreciation, Depletion and Amortization, Sale or Disposal of Property, Plant and Equipment 3,896,000  
Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property $ (49,000)