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Stock-based Compensation (Schedule of Stock Option Activity) (Details) - USD ($)
12 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Number of Shares Subject to Option    
Balance, beginning 187,500  
Granted 3,000  
Exercised (16,300) (8,130)
Forfeited or expired (3,750)  
Outstanding, ending 170,450 187,500
Vested or expected to vest, end of period 163,794  
Exercisable, end of period 124,650  
Weight Average Exercise Price    
Balance, beginning $ 23.38  
Granted 25.12  
Exercised 18.22  
Forfeited or expired 26.02  
Outstanding, ending 23.84 $ 23.38
Vested or expected to vest, end of period 23.75  
Exercisable, end of period $ 23.00  
Weighted Average Remaining Contractual Term    
Outstanding 5 years 8 months 23 days 6 years 3 months 4 days
Granted 9 years 8 months 9 days  
Vested or expected to vest, end of period 5 years 7 months 6 days  
Exercisable, end of period 4 years 6 months 22 days  
Aggregate Intrinsic Value    
Outstanding end of period $ 469,132  
Vested or expected to vest, end of period 457,193  
Exercisable, end of period $ 469,132