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Stockholders' Equity - Common Stock Dividends and Buyback Program (Details) - USD ($) | 3 Months Ended | 65 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | May 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Shares of common stock outstanding (in shares) | 32,953,837 |  | 32,953,837 |
Cash dividends to common stockholders | $ 823,846 | $ 3,306,408 |  |
Common Stock |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Value of shares repurchased | $ 7,348 | $ 1,362,424 |  |
Number of treasury shares acquired (in shares) | 2,632 | 231,376 |  |
Average cost per share (in dollars per share) | $ 2.79 | $ 5.89 |  |
Common Stock | 2015 Share Repurchase Program |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Authorized amount to be repurchased |  |  |  | $ 5,000,000.0
Value of shares repurchased |  |  | $ 4,000,000.0 |
Treasury stock acquired (in shares) | 0 |  | 706,858 |
Average cost per share (in dollars per share) |  |  | $ 5.72 |

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