Annual report pursuant to Section 13 and 15(d)

Summary of significant accounting policies (Details Textual)

v3.7.0.1
Summary of significant accounting policies (Details Textual) - USD ($)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Significant Accounting Policies [Line Items]    
Deferred Revenue, Current $ 761,491 $ 879,944
Deferred Revenue, Revenue Recognized $ 1,762,266 $ 563,485
Accounts Receivable [Member] | Customer Concentration Risk [Member]    
Significant Accounting Policies [Line Items]    
Concentration Risk, Percentage   11.30%