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Stock Option Plan (Tables)
12 Months Ended
Jun. 30, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of weighted-average grant-date fair value of the options
     
Option 
Shares
   
Weighted-
Average
Exercise Price
Per Share
 
Outstanding, June 30, 2016
        1,046,040         $ 11.83    
Exercised
        (468,400)         $ 11.83    
Outstanding, June 30, 2017
        577,640         $ 11.83    
Exercisable, June 30, 2017
        577,640         $ 11.83