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Note 12 - Shareholders' Equity - Stock Option Transactions (Details) - USD ($)
 12 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2021
Plan 1989 [Member]      
Outstanding, options shares (in shares) 231,000 231,000  
Outstanding, weighted average exercise price (in dollars per share) $ 6.05 $ 6.05  
Granted, options shares (in shares) 0 0 231,000
Exercised, options shares (in shares) 0 0  
Forfeited, options shares (in shares) (2,000) 0  
Forfeited, weighted average exercise price (in dollars per share) $ 6.05    
Outstanding, options shares (in shares) 229,000 231,000 231,000
Outstanding, weighted average exercise price (in dollars per share) $ 6.05 $ 6.05 $ 6.05
Outstanding, weighted average remaining contractual life (Year) 7 years 11 months 23 days    
Outstanding, aggregate intrinsic value $ 0    
Plan 1997 [Member]      
Outstanding, options shares (in shares) 2,000 2,000  
Outstanding, weighted average exercise price (in dollars per share) $ 2.74 $ 2.74  
Granted, options shares (in shares) 0 0  
Exercised, options shares (in shares) 0 0  
Forfeited, options shares (in shares) 0 0  
Outstanding, options shares (in shares) 2,000 2,000 2,000
Outstanding, weighted average exercise price (in dollars per share) $ 2.74 $ 2.74 $ 2.74
Outstanding, weighted average remaining contractual life (Year) 4 years 8 months 19 days    
Outstanding, aggregate intrinsic value $ 1,000