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Stock Options - Plan Information (Details) - USD ($)
 1 Months Ended 3 Months Ended 15 Months Ended
Dec. 31, 2022
May 31, 2020
Dec. 31, 2018
Dec. 31, 2012
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Jun. 30, 2025
Jun. 30, 2024
Stock Options                  
Stock-based compensation expense, allocated         $ 309,000 $ 371,000      
Basic earnings per share from share based compensation costs         $ 0.01 $ 0.01      
Diluted earnings per share from share based compensation costs         $ 0.01 $ 0.01      
Exercised         18,000        
Proceeds from stock option exercises           $ 54,000      
2012 Employee Stock Option Plan                  
Stock Options                  
Shares authorized (in shares)       1,900,000          
Threshold percentage of voting rights       10.00%          
Premium on fair market value (as a percent)       110.00%          
Term       10 years          
Vesting rights percentage       20.00%          
Outstanding (in shares)         337,036 361,036 337,036 361,036 363,036
Exercisable, end of period         267,136 198,060 267,136    
Available for grant (in shares)         0   0    
Exercised         18,000 2,000      
Shares withheld         10,097        
Proceeds from stock option exercises         $ 0 $ 54,000      
Deferred tax benefit         48,000 $ 0      
Unearned stock based compensation         $ 83,000   $ 83,000    
Vested         7,500 9,100      
Fair Value         $ 100,000 $ 112,000      
2012 Non-Employee Stock Option Plan                  
Stock Options                  
Shares authorized (in shares)       100,000          
Term       10 years          
Vesting rights percentage       20.00%          
Outstanding (in shares)         20,400 20,400 20,400 20,400 20,400
Exercisable, end of period         18,480 16,560 18,480    
Available for grant (in shares)         0   0    
Exercised         0 0      
Proceeds from stock option exercises         $ 0 $ 0      
Deferred tax benefit         0 $ 0      
Unearned stock based compensation         $ 0   $ 0    
Vested         0 0      
2018 Non-Employee Stock Option Plan                  
Stock Options                  
Shares authorized (in shares)     100,000            
Term     10 years            
Vesting rights percentage     20.00%            
Outstanding (in shares)         64,900 64,900 64,900 64,900 68,900
Exercisable, end of period         62,200 59,500 62,200    
Available for grant (in shares)         4,000   4,000    
Granted         0 0      
Exercised         0 0      
Proceeds from stock option exercises         $ 0        
Deferred tax benefit         0 $ 0      
Unearned stock based compensation         $ 0   $ 0    
Vested         0 0      
2018 Non-Employee Stock Option Plan | Options granted after December 2028                  
Stock Options                  
Granted         0        
2020 Non-Employee Stock Option Plan                  
Stock Options                  
Shares authorized (in shares)   100,000              
Term   10 years              
Vesting rights percentage   20.00%              
Outstanding (in shares)         51,900 51,900 51,900 51,900 56,900
Exercisable, end of period         42,520 34,140 42,520    
Available for grant (in shares)         45,100   45,100    
Granted         0 0      
Exercised         0 3,000      
Number of Stock options settled by withholding of shares           3,000      
Shares withheld           2,151      
Deferred tax benefit         $ 0 $ 7,000      
Unearned stock based compensation         $ 60,000   $ 60,000    
Vested         4,000 7,000      
Fair Value         $ 53,000 $ 79,000      
2020 Non-Employee Stock Option Plan | Options granted after May 2030                  
Stock Options                  
Granted         0        
2022 Employee Stock Option Plan                  
Stock Options                  
Shares authorized (in shares) 950,000                
Threshold percentage of voting rights 10.00%                
Premium on fair market value (as a percent) 110.00%                
Term 10 years                
Vesting rights percentage 20.00%                
Outstanding (in shares)         130,000 130,000 130,000 130,000 130,000
Exercisable, end of period         52,000 26,000 52,000    
Available for grant (in shares)         820,000   820,000    
Granted         0 0      
Exercised             0    
Proceeds from stock option exercises         $ 0 $ 0      
Deferred tax benefit         0 $ 0      
Unearned stock based compensation         $ 1,396,000   $ 1,396,000    
Vested         0 0      
2022 Employee Stock Option Plan | Options granted after December 2032                  
Stock Options                  
Granted         0