Annual report pursuant to Section 13 and 15(d)

Stockholder's Equity - Common Stock (Details)

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Stockholder's Equity - Common Stock (Details) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Class of Stock [Line Items]        
Repurchases of common stock $ 0 $ 0 $ 2,041,851  
Capital stock non-convertible, shares issued (in shares) 11,960,225 11,915,830    
Capital Stock        
Class of Stock [Line Items]        
Authorized amount of shares to be repurchased       $ 10,000,000
Repurchase of common stock (in shares)     90,613  
Repurchases of common stock     $ 2,000,000