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Summary of Significant Accounting Policies and New Accounting Standards (Tables)
 3 Months Ended
Sep. 30, 2015
Accounting Policies [Abstract]  
Schedule of net income per share and weighted average shares
​ ​ ​
Three Months
 ​
For the Periods Ended September 30
 ​ ​
2015
 ​ ​
2014
 ​
Net income
 ​ ​ ​ $ 18,753 ​ ​ ​ ​ $ 18,932 ​ ​
Weighted average number of shares – basic
 ​ ​ ​ ​ 39,092 ​ ​ ​ ​ ​ 38,900 ​ ​
Dilutive effect of stock options and warrant
 ​ ​ ​ ​ 920 ​ ​ ​ ​ ​ 684 ​ ​
Weighted average number of shares – diluted
 ​ ​ ​ ​ 40,012 ​ ​ ​ ​ ​ 39,584 ​ ​
Net income per share: ​ ​ ​ ​ ​ ​ ​ ​
basic
 ​ ​ ​ $ 0.48 ​ ​ ​ ​ $ 0.49 ​ ​
diluted
 ​ ​ ​ $ 0.47 ​ ​ ​ ​ $ 0.48 ​ ​