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Stock Options - Additional Information (Details) - USD ($)
3 Months Ended 15 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Jun. 30, 2021
Jun. 30, 2020
Stock options          
Stock-based compensation expense, allocated $ 89,000 $ 104,000      
Stock-based compensation costs, effect on EPS $ 0.00 $ 0.01      
Proceeds from stock option exercises $ 16,000        
2012 Employee Stock Option Plan          
Stock options          
Shares authorized (in shares) 950,000   950,000    
Premium on fair market value (as a percent) 110.00%        
Threshold percentage of voting rights 10.00%        
Term 10 years        
Vesting rights percentage 20.00%        
Outstanding (in shares) 104,540 117,840 104,540 107,040 117,840
Exercisable, end of period 48,988 37,400 48,988    
Available for grant (in shares) 738,460   738,460    
Granted 0 0      
Unearned stock based compensation $ 499,000   $ 499,000    
Exercised 2,500        
Deferred tax benefit $ 0        
Vested 2,400 2,400      
Fair Value $ 29,000 $ 29,000      
Proceeds from stock option exercises $ 16,000        
2012 Employee Stock Option Plan | Employee          
Stock options          
Exercised 2,500 0      
2012 Non-Employee Stock Option Plan          
Stock options          
Shares authorized (in shares) 50,000   50,000    
Term 10 years        
Vesting rights percentage 20.00%        
Outstanding (in shares) 6,000 12,000 6,000 6,000 12,000
Exercisable, end of period 3,120 5,760 3,120    
Available for grant (in shares) 4,800   4,800    
Granted 0 0      
Unearned stock based compensation $ 10,000   $ 10,000    
Exercised 0 0      
Deferred tax benefit $ 0 $ 0      
Vested 0 0      
Proceeds from stock option exercises $ 0 $ 0      
2012 Non-Employee Stock Option Plan | Non Employee          
Stock options          
Exercised 0        
2018 Non-Employee Stock Option Plan          
Stock options          
Shares authorized (in shares) 50,000   50,000    
Term 10 years        
Vesting rights percentage 20.00%        
Outstanding (in shares) 35,050 48,400 35,050 35,050 48,400
Exercisable, end of period 14,980 12,240 14,980    
Available for grant (in shares) 11,750   11,750    
Granted 0 0 0    
Unearned stock based compensation $ 186,000   $ 186,000    
Exercised 0   0    
Deferred tax benefit     $ 0    
Vested     0    
Proceeds from stock option exercises     $ 0    
2020 Non-Employee Stock Option Plan          
Stock options          
Shares authorized (in shares) 50,000   50,000    
Term 10 years        
Vesting rights percentage 20.00%        
Outstanding (in shares) 5,000 5,000 5,000 5,000  
Exercisable, end of period 2,000 1,000 2,000    
Available for grant (in shares) 45,000   45,000    
Granted 0 5,000      
Unearned stock based compensation $ 34,000   $ 34,000    
Exercised     0    
Deferred tax benefit     $ 0    
Vested     1,000    
Fair Value $ 12,000 $ 12,000      
Proceeds from stock option exercises     $ 0