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Stockholders' Equity - Common Stock Dividends and Buyback Program (Details)
3 Months Ended 12 Months Ended 22 Months Ended 28 Months Ended
Dec. 31, 2013
$ / shares
Sep. 30, 2017
USD ($)
$ / shares
shares
Jun. 30, 2017
$ / shares
Mar. 31, 2017
$ / shares
Dec. 31, 2016
$ / shares
Sep. 30, 2016
USD ($)
$ / shares
shares
Jun. 30, 2016
$ / shares
Mar. 31, 2016
$ / shares
Dec. 31, 2015
$ / shares
Sep. 30, 2015
$ / shares
Jun. 30, 2015
$ / shares
Mar. 31, 2015
$ / shares
Jun. 30, 2017
increase
Sep. 30, 2017
shares
Sep. 30, 2017
USD ($)
$ / shares
shares
May 12, 2015
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                
Shares of common stock outstanding | shares   33,066,717                       33,066,717 33,066,717  
Cash dividend (in dollars per share) | $ / shares $ 0.10 $ 0.075 $ 0.07 $ 0.07 $ 0.065 $ 0.05 $ 0.05 $ 0.05 $ 0.05 $ 0.05 $ 0.05 $ 0.05        
Number of increases to quarterly cash dividend | increase                         2      
Cash dividends to common stockholders   $ 2,481,471       $ 1,652,290                    
Common Stock | 2015 Share Repurchase Program                                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                
Authorized amount to be repurchased                               $ 5,000,000
Value of shares repurchased   $ 110,753       $ 330,070                 $ 1,609,008  
Number of treasury shares acquired | shares   15,284       58,147               0 265,762  
Average cost per share (in dollars per share) | $ / shares   $ 7.25       $ 5.68                 $ 6.05