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Stockholders' Equity - Series A Cumulative Perpetual Preferred Stock (Details) - USD ($)
 6 Months Ended 12 Months Ended
Sep. 30, 2016
Dec. 31, 2016
Dec. 31, 2015
Jun. 30, 2016
Series A Cumulative Perpetual Preferred Stock        
Consideration paid to preferred shareholders at redemption at liquidation preference   $ 7,932,975    
Cash dividends to preferred stockholders   250,990 $ 337,151  
Preferred        
Series A Cumulative Perpetual Preferred Stock        
Consideration paid to preferred shareholders at 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%
Preferred stock, liquidation preference (in dollars per share)       $ 25.00
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% 8.50%    
Preferred stock, liquidation preference (in dollars per share) $ 25.00 $ 25.00    
Redemption price per share (in dollars per share) $ 25.082639      
Consideration paid to preferred shareholders at redemption at liquidation preference $ 7,932,975      
Payments for dividends accrued [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   $ 250,990 $ 337,151  
[1] Includes the monthly dividend for October 2016 declared by the Company.
[2] epresenting the difference between the redemption consideration paid and the historical net issuance proceeds 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.