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Stockholders' Equity - Series A Cumulative Perpetual Preferred Stock (Details) - USD ($) | 6 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Jun. 30, 2015
Series A Cumulative Perpetual Preferred Stock |  |  |
Cash dividends to preferred stockholders | $ 337,151 | $ 337,151 |
Preferred |  |  |
Series A Cumulative Perpetual Preferred Stock |  |  |
Percentage of cash dividends treated as qualified dividend income |  |  | 100.00%
Common Stock |  |  |
Series A Cumulative Perpetual Preferred Stock |  |  |
Percentage of cash dividends treated as qualified dividend income |  |  | 14.00%
Percentage of cash dividends treated as return of capital |  |  | 86.00%
Series A cumulative perpetual preferred stock |  |  |
Series A Cumulative Perpetual Preferred Stock |  |  |
Number of shares sold of series A cumulative perpetual preferred stock | 317,319 |  |
Preferred stock dividend rate (as a percent) | 8.50% |  | 8.50%
Amount of sinking fund available to stockholders | $ 0 |  |
Preferred stock, liquidation preference (in dollars per share) | $ 25.00 |  | $ 25.00
Dividend payable monthly on preferred stock (in dollars per share) | $ 0.177083 |  |
Cash dividends to preferred stockholders | $ 337,151 | $ 337,151 |

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