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Stock-based Compensation (Schedule of Stock Option Activity) (Details) - USD ($)
12 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Number of Shares Subject to Option    
Balance, beginning 170,450  
Granted 41,150  
Exercised (8,300) (16,300)
Forfeited or expired (5,500)  
Outstanding, ending 197,800 170,450
Vested or expected to vest, end of period 191,230  
Exercisable, end of period 154,900  
Weight Average Exercise Price    
Balance, beginning $ 23.84  
Granted 26.25  
Exercised 18.18  
Forfeited or expired 24.11  
Outstanding, ending 24.57 $ 23.84
Vested or expected to vest, end of period 24.52  
Exercisable, end of period $ 24.13  
Weighted Average Remaining Contractual Term    
Outstanding 5 years 10 months 10 days 5 years 8 months 23 days
Granted 9 years 5 months 5 days  
Vested or expected to vest, end of period 5 years 8 months 26 days  
Exercisable, end of period 4 years 10 months 21 days  
Aggregate Intrinsic Value    
Outstanding end of period $ 124,384  
Vested or expected to vest, end of period 124,384  
Exercisable, end of period $ 124,384