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Stockholders' Equity - Series A Cumulative Perpetual Preferred Stock (Details) - USD ($)
 3 Months Ended 12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Jun. 30, 2016
Series A Cumulative Perpetual Preferred Stock      
Consideration to preferred shareholders upon redemption at liquidation preference $ 7,932,975    
Cash dividends to preferred stockholders 168,575 $ 168,575  
Preferred      
Series A Cumulative Perpetual Preferred Stock      
Consideration to preferred shareholders upon redemption at liquidation preference $ 317    
Series A cumulative perpetual preferred stock      
Series A Cumulative Perpetual Preferred Stock      
Preferred stock dividend rate (as a percent) 8.50%   8.50%
Cash dividends to preferred stockholders   $ 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    
Redemption price per share (in dollars per share) $ 25.082639    
Consideration to preferred shareholders upon redemption at liquidation preference $ 7,932,975    
Accrued and unpaid dividends [1] 82,415    
Deemed dividend [2] 1,002,440    
Amount of sinking fund available to stockholders $ 0    
Dividend payable monthly on preferred stock (in dollars per share) $ 0.177083    
Cash dividends to preferred stockholders $ 168,575    
[1] Includes the monthly dividend for October 2016 declared by the Company.
[2] Represents the difference between the redemption consideration and the historical carrying value of the preferred shares. Accordingly, net income was adjusted for this deemed dividend to determine net income attributable to common shareholders and earnings per common share.