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Income Taxes - Summary of components of income tax expense (Details) - USD ($)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Current:      
Federal $ 37,591 $ (322,723) $ 408,056
State 26,374 (60,104) 187,266
Total current 63,965 (382,827) 595,322
Deferred income (benefits) taxes:      
Federal (185,031) 352,543 (253,848)
State 38,002 275,205 (32,822)
Total deferred (benefits) taxes (147,029) 627,749 (286,670)
Income tax expense $ (83,064) $ 244,921 $ 308,652