Annual report pursuant to Section 13 and 15(d)

Commitments and Contingencies (Details Textual)

v3.19.1
Commitments and Contingencies (Details Textual) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Loss Contingencies [Line Items]      
Operating Leases, Rent Expense $ 286,000 $ 293,000 $ 257,000