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Note G - Income Taxes (Details Textual) - USD ($)
$ in Thousands
 12 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Federal, State and Local Income Tax Expense (Benefit), Gross, Continuing Operations $ 2,700 $ 2,200
Foreign Income Tax Expense (Benefit), Continuing Operations 100  
Deferred Tax Assets, Valuation Allowance 4,814 (0)
Deferred Tax Assets, Gross $ 14,347 $ 12,563
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 21.00% 21.00%
Dividends and Interest Paid   $ 5,400
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount   $ 0
Fiscal Years After June 30, 2025 [Member]    
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 21.00%  
Domestic Tax Jurisdiction [Member]    
Deferred Tax Assets, Valuation Allowance $ 4,800  
Deferred Tax Assets, Gross 4,800  
Deferred Tax Assets, Net of Valuation Allowance 0  
Operating Loss Carryforwards 8,000  
State and Local Jurisdiction [Member]    
Operating Loss Carryforwards 6,800  
Foreign Tax Jurisdiction [Member]    
Operating Loss Carryforwards $ 800  
Foreign Tax Jurisdiction [Member] | Swiss Federal Tax Administration (FTA) [Member]    
Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Percent   5.00%
Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Amount   $ 300