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Stock Option - Plan Information (Details) - USD ($)
12 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2019
Stock Option        
Stock-based compensation expense, allocated $ 1,649,000 $ 435,000 $ 583,000  
Proceeds from stock option exercises $ 155,000   $ 80,000  
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) 523,080 214,080 235,680 145,000
Exercisable, end of period 176,752 98,176 70,000  
Available for grant (in shares) 1,138,920      
Granted 338,000 0 141,880  
Unearned stock based compensation $ 2,489,000      
Exercised 29,000 8,600 31,200  
Deferred tax benefit $ 0 $ 0 $ 0  
Conversion of Stock, Shares Issued 153 4,604 3,256  
Fair Value $ 1,040,000 $ 244,000 $ 197,000  
Proceeds from stock option exercises $ 155,000 $ 0 $ 79,000  
2012 Employee Stock Option Plan | Tranche One        
Stock Option        
Exercised 1,000 8,600 7,200  
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 24,000 20,400
Exercisable, end of period 11,280 6,240 11,520  
Available for grant (in shares) 0      
Granted 9,600 0 3,600  
Unearned stock based compensation $ 70,000      
Exercised 1,200 2,400 0  
Deferred tax benefit $ 4,000 $ 6,000 $ 0  
Conversion of Stock, Shares Issued 258 612    
Fair Value $ 39,000 $ 18,000 $ 18,000  
2012 Non-Employee Stock Option Plan | Tranche One        
Stock Option        
Exercised 1,200 2,400    
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) 89,000 70,100 96,800 30,400
Exercisable, end of period 45,040 29,960 24,480  
Available for grant (in shares) 0      
Granted 23,500 0 66,400  
Unearned stock based compensation $ 265,000      
Exercised 4,600 3,200 0  
Deferred tax benefit $ 12,000 $ 6,000 $ 0  
Conversion of Stock, Shares Issued 2,075 1,518    
Fair Value $ 160,000 $ 133,000 $ 133,000  
2018 Non-Employee Stock Option Plan | Tranche One        
Stock Option        
Exercised 4,600 3,200    
2020 Non-Employee Stock Option Plan        
Stock Option        
Stock-based compensation expense, allocated $ 135,000      
Shares authorized (in shares) 100,000      
Term 10 years      
Vesting rights percentage 20.00%      
Outstanding (in shares) 26,900 10,000    
Exercisable, end of period 7,380 2,000    
Available for grant (in shares) 73,100      
Granted 16,900 10,000 0  
Exercised 0 0 0  
Fair Value $ 55,000 $ 12,000 $ 0