Annual report pursuant to Section 13 and 15(d)

Defined contribution plan (Details Textual)

v3.7.0.1
Defined contribution plan (Details Textual) - USD ($)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Defined Contribution Plan, Cost Recognized $ 1,614,299 $ 1,868,879