Quarterly report pursuant to Section 13 or 15(d)

Income taxes (Details)

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Income taxes (Details) - USD ($)
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Income Tax Disclosure [Abstract]    
Benefit for income taxes $ 65,951 $ 610,495
Effective income tax rate 10.48% 33.83%