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Stockholders' Equity - Series A Cumulative Perpetual Preferred Stock (Details) - USD ($)
 1 Months Ended 9 Months Ended
Nov. 30, 2016
Sep. 30, 2016
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2016
Series A Cumulative Perpetual Preferred Stock          
Cash dividends to preferred stockholders     $ 0 $ 250,990  
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      
Cash dividends to preferred stockholders         $ 250,990