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Stock Option - Plan Information (Details) - USD ($)
3 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
May 31, 2020
Dec. 31, 2018
Stock Option            
Stock-based compensation expense, allocated $ 477,000 $ 89,000        
Stock-based compensation costs, effect on EPS, basic $ 0.01 $ 0.00        
Stock-based compensation costs, effect on EPS, diluted $ 0.01 $ 0.00        
Granted 0 0        
Proceeds from stock option exercises $ 45,000 $ 16,000        
2022 Employee Stock Option Plan            
Stock Option            
Shares authorized (in shares) 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) 0          
Granted 0          
2012 Employee Stock Option Plan            
Stock Option            
Shares authorized (in shares) 1,900,000          
Premium on fair market value (as a percent) 110.00%          
Term 10 years          
Vesting rights percentage 20.00%          
Outstanding (in shares) 555,380 209,080 523,080 214,080    
Exercisable, end of period 183,852 97,976        
Available for grant (in shares) 1,101,420          
Granted 37,500 0        
Unearned stock based compensation $ 2,651,000          
Exercised 5,200 5,000        
Vested 12,300 4,800        
Fair Value $ 129,000 $ 29,000        
Proceeds from stock option exercises $ 45,000 $ 16,000        
2012 Employee Stock Option Plan | After December 2022            
Stock Option            
Granted 0          
2012 Non-Employee Stock Option Plan            
Stock Option            
Shares authorized (in shares) 100,000          
Threshold percentage of voting rights 10.00%          
Term 10 years          
Vesting rights percentage 20.00%          
Outstanding (in shares) 20,400 12,000 20,400 12,000    
Exercisable, end of period 11,280 6,240        
Available for grant (in shares) 0          
Granted 0          
Unearned stock based compensation $ 64,000          
Exercised 0 0        
Deferred tax benefit $ 0 $ 0        
Vested 0 0        
Proceeds from stock option exercises $ 0 $ 0        
2012 Non-Employee Stock Option Plan | After December 2022            
Stock Option            
Granted 0          
2018 Non-Employee Stock Option Plan            
Stock Option            
Shares authorized (in shares)           100,000
Term 10 years          
Vesting rights percentage 20.00%          
Outstanding (in shares) 82,700 70,100 89,000 70,100    
Exercisable, end of period 38,740 29,960        
Available for grant (in shares) 0          
Granted 0          
Unearned stock based compensation $ 228,000          
Exercised 6,300 0        
Shares converted (in shares) 3,020          
Deferred tax benefit $ 21,000 $ 0        
Vested 0          
Proceeds from stock option exercises $ 0          
2018 Non-Employee Stock Option Plan | After December 2028            
Stock Option            
Granted 0          
2020 Non-Employee Stock Option Plan            
Stock Option            
Shares authorized (in shares)         100,000  
Term 10 years          
Vesting rights percentage 20.00%          
Outstanding (in shares) 51,900 10,000 26,900 10,000    
Exercisable, end of period 14,380 4,000        
Available for grant (in shares) 48,100          
Granted 25,000 0        
Unearned stock based compensation $ 374,000          
Exercised 0 0        
Deferred tax benefit $ 0 $ 0        
Vested 7,000 2,000        
Fair Value $ 79,000 $ 12,000        
Proceeds from stock option exercises $ 0 $ 0        
2020 Non-Employee Stock Option Plan | After May 2030            
Stock Option            
Granted 0