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Stockholders' Equity - Treasury Shares (Details) - USD ($) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2015 | Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2016
Equity, Class of Treasury Stock [Line Items] |  |  |  |
Total cost of treasury shares acquired |  | $ 571,083 | $ 537,014 | $ 1,263,402
Common Stock |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |
Number of treasury shares acquired (shares) |  | 73,208 | 83,675 | 218,682
Common Stock | 2015 Share Repurchase Program |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |
Number of treasury shares acquired (shares) | 265,762 | 73,208 | 83,675 | 218,682
Average cost per share (in USD per share) | $ 6.05 | $ 7.80 | $ 6.42 | $ 5.78
Total cost of treasury shares acquired | $ 1,609,008 | $ 571,083 | $ 537,014 | $ 1,263,402

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