Annual report pursuant to Section 13 and 15(d)

Operating Segments (Details Textual)

v3.19.1
Operating Segments (Details Textual)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Sales Revenue, Segment [Member]    
Revenue, Major Customer [Line Items]    
Concentration Risk, Percentage 18.00% 15.00%