Quarterly report pursuant to Section 13 or 15(d)

Income taxes (Details)

v3.5.0.2
Income taxes (Details) - USD ($)
3 Months Ended 9 Months Ended 16 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Income Tax Disclosure [Abstract]          
Release of valuation allowance         $ 7,700,000
Provision (benefit) for income taxes $ 4,046,961 $ (922,427) $ 3,567,299 $ 5,619,504  
Effective income tax rate 170.80% (95.50%) 91.60% 3934.80%  
Net deferred tax assets $ 13,800,000   $ 13,800,000   13,800,000
Net operating loss carryforwards $ 6,500,000   $ 6,500,000   $ 6,500,000