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Stock Options (Narrative) (Detail) - USD ($)
3 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unearned stock-based compensation cost related to non-vested awards $ 72,000      
Allocated Share Based Compensation Expense $ 5,000 $ 33,000    
Share based Compensation Cost Effect On Earnings Per Share Basic And Diluted $ 0.00 $ 0.00    
Proceeds From Stock Options Exercised $ 15,000 $ 12,000    
2012 Employee Stock Option Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares authorized for issuance under the plan 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, exercisable 27,900 41,700    
Number of stock options available for grant 817,900      
Unearned stock-based compensation cost related to non-vested awards $ 147,000      
Fair value of stock options that vested during the period 13,000 $ 16,000    
Tax benefit from ISO option exercise $ 0 $ 0    
Number of shares outstanding, end of period 58,700 68,600 57,200 70,600
Common Stock, Voting Rights Any plan participant who is granted ISOs and possesses more than 10% of the voting rights of the Company's outstanding common stock      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period 2,500 2,000    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 4,000 0    
Proceeds From Stock Options Exercised $ 16,000 $ 13,000    
2012 Non-Employee Stock Option Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares authorized for issuance under the plan 50,000      
Term of stock option awards 10 years      
Annual rate at which share-based compensation awards vest 20.00%      
Number of stock options, exercisable 13,800 10,200    
Fair value of stock options that vested during the period $ 0 $ 17,000    
Tax benefit from ISO option exercise $ 0 $ 0    
Number of shares outstanding, end of period 27,800 14,200 27,800 14,200
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period 0 0    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 0 0    
2002 Employee Stock Option Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares authorized for issuance under the plan 1,836,000      
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%      
Tax benefit from ISO option exercise $ 0 $ 0    
Conversion of Stock, Shares Issued 2,815      
Common Stock, Voting Rights Any plan participant who was granted ISOs and possessed more than 10% of the voting rights of the Company's outstanding common stock      
Conversion of Stock, Shares Converted 5,000      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period 0 5,000