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Shareholders' Equity and Debt - Shareholders' Equity (Details) - USD ($)
 1 Months Ended 6 Months Ended
Nov. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Jan. 31, 2016
May 13, 2010
Shareholders Equity [Abstract]          
Repurchase outstanding common shares       $ 10,000,000 $ 10,000,000
Repurchase of shares, value   $ (1,979,730)      
Shelf Registration, sale of corporate securities (up to) $ 100,000,000        
Sales of shares of common stock, net of offering costs   $ 200,909 $ 0    
Restricted Stock          
Shareholders Equity [Abstract]          
Restricted stock granted in period, shares   233,330      
Director | Restricted Stock          
Shareholders Equity [Abstract]          
Restricted stock awards, vesting period   1 year      
Common Stock [Member]          
Shareholders Equity [Abstract]          
Repurchase of shares (in shares)   299,370 282,856    
Repurchase of shares, value   $ (1,979,730) $ 1,800,000    
Proceeds from the sale of common stock, net of offering costs (in shares)   30,704