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Stockholders' Equity - Treasury Shares (Details) - USD ($) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2015 | Jun. 30, 2019 | Jun. 30, 2018
Equity, Class of Treasury Stock [Line Items] |  |  |  |
Total cost of treasury shares acquired |  |  | $ 156,791 | $ 571,083
Common Stock |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |
Number of treasury shares acquired (shares) |  |  | 18,424 | 73,208
Common Stock | 2015 Share Repurchase Program |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |
Number of treasury shares acquired (shares) | 430 | 266,192 | 18,424 | 73,208
Average cost per share (in USD per share) | $ 6.07 | $ 6.05 | $ 8.51 | $ 7.80
Total cost of treasury shares acquired |  | $ 1,611,620 | $ 156,791 | $ 571,083

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