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Stock Options (Narrative) (Detail) - USD ($)
12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Fair value of stock options that vested during the period $ 106,000 $ 10,000  
Tax benefit from ISO option exercise   0 $ 0
Allocated Share Based Compensation Expense $ 146,000 $ 102,000  
Share based Compensation Cost Effect On Earnings Per Share Basic And Diluted $ 0.01 $ 0.01  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period 452    
Proceeds From Stock Options Exercised $ 106,000 $ 49,000  
Exercise price of stock options received in entity shares [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Proceeds From Stock Options Exercised $ 0 $ 0  
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 30,400 38,700  
Number of stock options available for grant 821,900    
Unearned stock-based compensation cost related to non-vested awards $ 129,000    
Fair value of stock options that vested during the period $ 86,000 $ 79,000  
Number of shares outstanding, end of period 57,200 70,600 112,500
Conversion of Stock, Shares Issued 7,940    
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 34,400 35,500  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 25,000 5,000  
2012 Employee Stock Option Plan [Member] | Exercise price of stock options received in entity shares [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 18,000    
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 5,200  
Unearned stock-based compensation cost related to non-vested awards $ 72,000    
Fair value of stock options that vested during the period $ 39,000 $ 22,000  
Number of shares outstanding, end of period 27,800 14,200 35,000
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    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period 1,400 20,800  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 15,000 0  
2012 Non-Employee Stock Option Plan [Member] | Exercise price of stock options received in entity shares [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 0 5,000  
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 59,418  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period 5,000 87,000  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross   34,400  
Proceeds From Stock Options Exercised $ 80,500 $ 87,000