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Summary of Significant Accounting Policies and New Accounting Standards (Tables)
 12 Months Ended
Jun. 30, 2015
Accounting Policies [Abstract]  
Schedule of Net Income per Share and Weighted Average Shares
For the Periods Ended June 30
​ ​
2015
​ ​
2014
​ ​
2013
​
Net income
 ​ ​ ​ $ 60,280 ​ ​ ​ ​ $ (3,127) ​ ​ ​ ​ $ 24,891 ​ ​
Weighted average number of shares–basic
 ​ ​ ​ ​ 38,969 ​ ​ ​ ​ ​ 32,193 ​ ​ ​ ​ ​ 30,458 ​ ​
Dilutive effect of stock options and warrant
 ​ ​ ​ ​ 846 ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​
Weighted average number of shares–diluted
 ​ ​ ​ ​ 39,815 ​ ​ ​ ​ ​ 32,193 ​ ​ ​ ​ ​ 30,458 ​ ​
Net income per share: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
basic
 ​ ​ ​ $ 1.55 ​ ​ ​ ​ $ (0.10) ​ ​ ​ ​ $ 0.82 ​ ​
diluted
 ​ ​ ​ $ 1.51 ​ ​ ​ ​ $ (0.10) ​ ​ ​ ​ $ 0.82