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Earnings Per Share (Details) - USD ($)
3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Basic income per share                    
Net income for the period - numerator $ (1,636,333) $ 1,572,335 $ 15,917 $ 1,707,869 $ 3,070,724 $ 3,034,542 $ 2,581,606 $ (1,373,896) $ 1,659,788 $ 7,312,976
Weighted average common stock outstanding - denominator                 21,450,316 21,416,143
Net income per share $ 0.076 $ 0.07 $ 0.001 $ 0.08 $ 0.14 $ 0.14 $ 0.12 $ (0.06) $ 0.08 $ 0.34
Diluted income per share                    
Net income for the period - numerator $ (1,636,333) $ 1,572,335 $ 15,917 $ 1,707,869 $ 3,070,724 $ 3,034,542 $ 2,581,606 $ (1,373,896) $ 1,659,788 $ 7,312,976
Weighted average common stock outstanding - denominator                 21,450,316 21,416,143
Effect of dilution                
Weighted average common stock outstanding - denominator                 21,450,316 21,416,143
Diluted income per share $ 0.076 $ 0.07 $ 0.001 $ 0.08 $ 0.14 $ 0.14 $ 0.12 $ (0.06) $ 0.08 $ 0.34