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Stock Based Compensation (Narrative) (Details) - USD ($)
3 Months Ended 6 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Jun. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock based compensation expense $ 29,048 $ 29,715 $ 50,470 $ 53,048  
Deferred tax benefit related to stock based compensation 1,602 $ 2,359 2,771 $ 4,124  
Unrecognized compensation costs 189,343   $ 189,343    
Period in which compensation cost will be recognized     2 years    
Deferred tax benefit related to unrecognized compensation costs $ 10,772   $ 10,772    
Granted     51,515    
Outstanding 248,065   248,065   197,800
Cash divided paid     $ 0.50 $ 0.50  
Total intrinsic values of the options exercised     $ 0 $ 15,189  
2017 Plan [Member] | Stock Option Plans [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period     2 years    
Expiration period     10 years    
Authorized shares under plan 400,000   400,000    
Granted     51,515    
2017 Plan [Member] | Non employee directors [Member] | Maximum [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Authorized shares under plan 133,000   133,000    
Percentage of total number of shares subject to options or awards, single fiscal year     33.33%    
Number of shares subject to option or award, single fiscal year 13,300   13,300    
2017 Plan [Member] | Individual Employee [Member] | Maximum [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of shares subject to option or award, single fiscal year 15,000   15,000    
2007 Plan [Member] | Stock Option Plans [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Outstanding 196,550   196,550    
Vested and exercisable shares 154,650   154,650