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Stockholders' Equity - Common Stock Dividends and Buyback Program (Details) - USD ($) | 9 Months Ended | 59 Months Ended |
--- | --- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2020 | May 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Shares of common stock outstanding (in shares) | 32,956,469 |  | 32,956,469 |
Cash dividends to common stockholders | $ 9,916,841 | $ 9,953,562 |  |
Shares forfeited (in shares) | 49,118 |  |  |
Common Stock |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Value of shares repurchased | $ 2,483,357 | $ 138,638 |  |
Number of treasury shares acquired (in shares) | 449,921 | 15,489 |  |
Average cost per share (in dollars per share) | $ 5.52 | $ 8.95 |  |
Common Stock | 2015 Share Repurchase Program |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Authorized amount to be repurchased |  |  |  | $ 5,000,000
Value of shares repurchased |  |  | $ 4,000,000 |
Treasury stock acquired (in shares) | 440,666 |  | 706,858 |
Average cost per share (in dollars per share) | $ 5.51 |  | $ 5.72 |

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