XML 47 R36.htm IDEA: XBRL DOCUMENT v3.19.1
Commitments and contingencies (Details Textual)
3 Months Ended
Mar. 31, 2019
USD ($)
Commitments and Contingencies [Line Items]  
Estimated Litigation Liability $ 6,200,000
Litigation Settlement, Expense $ 275,000
Interest Rate Description Litigation plus legal interest that accrued at 12% per annum from August 13, 2008 to June 30, 2013, and thereafter accrued and continues to accrue at 6% per annum