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Stockholders' Equity - Series A Cumulative Perpetual Preferred Stock (Details) - USD ($)
 3 Months Ended
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Series A Cumulative Perpetual Preferred Stock      
Cash dividends to preferred stockholders   $ 0 $ 168,575
Series A cumulative perpetual preferred stock | Preferred      
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%    
Preferred stock, liquidation preference (in dollars per share) $ 25.00   $ 25.00
Consideration paid to preferred shareholders at redemption at liquidation preference $ 7,932,975    
Deemed dividend $ 1,002,440   $ 1,002,440
Cash dividends to preferred stockholders     $ 168,575
Accrued preferred dividends through redemption date   $ 82,415