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Stock Options (Narrative) (Detail) - USD ($)
12 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Tax benefit from ISO option exercise $ 0 $ 0  
Cash received from option exercises 49,000 0 $ 0
Allocated Share Based Compensation Expense $ 102,000 $ 103,000 $ 101,000
Share based Compensation Cost Effect On Earnings Per Share Basic And Diluted $ 0.01 $ 0.01 $ 0.01
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, granted 5,000 15,000  
Number of stock options, exercisable 38,700    
Number of stock options available for grant 843,900    
Unearned stock-based compensation cost related to non-vested awards $ 119,000    
Fair value of stock options that vested during the period $ 79,000 $ 119,000  
Number of shares outstanding, end of period 70,600    
Conversion of Stock, Shares Issued   16,120  
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    
Stock Issued During Period Shares Stock Options Exercised 34,000    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 5,000 15,000  
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, granted 0 0  
Number of stock options, exercisable 5,200    
Number of stock options available for grant 15,000    
Unearned stock-based compensation cost related to non-vested awards $ 28,000    
Fair value of stock options that vested during the period $ 22,000 $ 22,000  
Number of shares outstanding, end of period 14,200    
Conversion of Stock, Shares Issued   9,998  
Stock Issued During Period Shares Stock Options Exercised 20,800    
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%    
Number of stock options, exercisable 5,000    
Tax benefit from ISO option exercise $ 0 $ 0  
Cash received from option exercises $ 39,000 $ 0  
Number of shares outstanding, end of period 1,471,480    
Stock Issued During Period, Shares, New Issues   53,868  
Conversion of Stock, Shares Issued   59,418  
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    
Stock Issued During Period Shares Stock Options Exercised 87,000 67,500