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Earnings Per Share (Details) - USD ($)
3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Basic income per share                      
Net income for the period - numerator $ 3,070,724 $ 3,034,542 $ 2,581,606 $ (1,373,896) $ 2,160,289 $ 1,685,897 $ 5,590,530 $ 2,105,489 $ 7,312,976 $ 11,542,205 $ 11,706,360
Weighted average common stock outstanding - denominator                 21,416,143 20,316,400 19,270,394
Net income per share $ 0.14 $ 0.14 $ 0.12 $ (0.06) $ 0.11 $ 0.08 $ 0.28 $ 0.1 $ 0.34 $ 0.57 $ 0.61
Diluted income per share                      
Net income for the period - numerator $ 3,070,724 $ 3,034,542 $ 2,581,606 $ (1,373,896) $ 2,160,289 $ 1,685,897 $ 5,590,530 $ 2,105,489 $ 7,312,976 $ 11,542,205 $ 11,706,360
Weighted average common stock outstanding - denominator                 21,416,143 20,316,400 19,270,394
Effect of dilution                
Weighted average common stock outstanding - denominator                 21,416,143 20,316,400 19,270,394
Diluted income per share $ 0.14 $ 0.14 $ 0.12 $ (0.06) $ 0.11 $ 0.08 $ 0.28 $ 0.1 $ 0.34 $ 0.57 $ 0.61