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Selected Statement of Operations Data (Details 3) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Selling and marketing expenses:      
Selling and marketing expenses $ 1,268 $ 1,250 $ 1,105
Selling and marketing expense [Member]      
Selling and marketing expenses:      
Payroll and related expenses 978 953 911
Depreciation and amortization 6 5 5
Travel and conventions 67 58 71
Other $ 217 $ 234 $ 118