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Stock Options - Additional Information (Details) - USD ($)
3 Months Ended 6 Months Ended 9 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Mar. 31, 2020
Dec. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2019
Jun. 30, 2020
Jun. 30, 2019
Stock options                      
Allocated Share Based Compensation Expense $ 84,000   $ 172,000       $ 272,000 $ 497,000      
Stock-based compensation costs, effect on EPS $ 0.00   $ 0.01       $ 0.01 $ 0.03      
Fair Value   $ 5,000 $ 3,000   $ 5,000            
Proceeds from stock option exercises               $ 71,000      
2012 Employee Plan                      
Stock options                      
Number of shares authorized for issuance under the plan 950,000           950,000        
Percentage Applied To Market Price To Set Grant Price For Grantee Owning Ten Percent Or More Of Entity Common Stock Outstanding             110.00%        
Term of stock option awards             10 years        
Annual rate at which share-based compensation awards vest             20.00%        
Number of stock options available for grant 731,960           731,960        
Unearned stock-based compensation cost related to non-vested awards $ 705,000           $ 705,000        
Tax benefit for option exercise             $ 3,000 $ 8,000      
Outstanding (in shares) 112,040   99,400       112,040 99,400   117,840 72,500
Exercised 1,800   14,100       1,800 14,100      
Exercisable 44,600   36,900       44,600 36,900      
Granted 0   1,800       0 41,000      
Vested 2,600   13,000       15,400 17,200      
Fair Value $ 63,000   $ 33,000         $ 168,000 $ 183,000    
Proceeds from stock option exercises $ 0   $ 71,000       $ 0 $ 71,000      
2012 Non-Employee Plan                      
Stock options                      
Number of shares authorized for issuance under the plan 50,000           50,000        
Term of stock option awards             10 years        
Annual rate at which share-based compensation awards vest             20.00%        
Number of stock options available for grant 0           0        
Unearned stock-based compensation cost related to non-vested awards $ 19,000           $ 19,000        
Tax benefit for option exercise   $ 6,000   $ 6,000 $ 6,000 $ 6,000          
Outstanding (in shares) 10,800   12,000       10,800 12,000   12,000 10,200
Exercised   1,200   1,200 1,200 1,200 1,200        
Exercisable 7,320   5,760       7,320 5,760      
Granted             0 1,800      
Vested     360       2,760 2,760      
Fair Value             $ 18,000,000 $ 18,000,000      
2018 Non-Employee Plan                      
Stock options                      
Number of shares authorized for issuance under the plan 50,000           50,000        
Term of stock option awards             10 years        
Annual rate at which share-based compensation awards vest             20.00%        
Number of stock options available for grant 0   33,200       0 33,200      
Unearned stock-based compensation cost related to non-vested awards $ 311,000           $ 311,000        
Tax benefit for option exercise $ 6,000   $ 6,000       $ 6,000 $ 6,000      
Outstanding (in shares) 46,800   48,400       46,800 48,400   48,400 15,200
Exercised             1,600        
Exercisable 20,480   12,240       20,480 12,240      
Granted   0     0   0 33,200      
Vested               24,400      
Fair Value $ 45,000,000   $ 88,000,000                
2020 Non-Employee Plan                      
Stock options                      
Number of shares authorized for issuance under the plan 50,000           50,000        
Term of stock option awards             10 years        
Annual rate at which share-based compensation awards vest             20.00%        
Number of stock options available for grant 45,000           45,000        
Number of stock options available for grant 0           5,000        
Unearned stock-based compensation cost related to non-vested awards $ 40,000           $ 40,000        
Tax benefit for option exercise   $ 0   $ 0 $ 0 $ 0          
Outstanding (in shares) 5,000           5,000        
Exercised 0   0       0 0      
Exercisable 1,000           1,000        
Granted             5,000        
Vested             1,000        
Fair Value             $ 12,000