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Shareholders' Equity and Debt - Shareholders' Equity (Details) - USD ($)
 1 Months Ended 3 Months Ended
Nov. 30, 2017
Mar. 31, 2018
Mar. 31, 2017
Jan. 31, 2016
Jan. 31, 2015
Jan. 31, 2013
Apr. 30, 2012
Jan. 31, 2011
May 13, 2010
Shareholders Equity [Abstract]                  
Repurchase outstanding common shares       $ 10,000,000 $ 10,000,000 $ 10,000,000 $ 10,000,000 $ 10,000,000 $ 10,000,000
Repurchase of shares, value   $ (1,195,225)              
Shelf Registration, sale of corporate securities (up to) $ 100,000,000                
Issuance of common stock (in shares)   30,704              
Gross proceeds from issuance of common stock   $ 200,909 $ 0            
Restricted Stock                  
Shareholders Equity [Abstract]                  
Restricted stock granted in period, shares   229,205              
Director | Restricted Stock                  
Shareholders Equity [Abstract]                  
Restricted stock awards, vesting period   1 year              
Range values are not currently supported                  
Shareholders Equity [Abstract]                  
Repurchase of shares (in shares)   172,079 155,150            
Repurchase of shares, value   $ (1,195,225) $ (1,000,000.0)            
Issuance of common stock (in shares)   30,704