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Selected Statement of Operations Data (Details 5) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
General and administrative expenses:      
General and administrative expenses $ 1,676 $ 1,393 $ 1,766
General and administrative expense [Member]      
General and administrative expenses:      
Payroll and related expenses 1,105 1,039 923
Depreciation and amortization 16 18 19
Insurance 42 50 55
Office Expenses 58 69 68
Professional services 326 242 276
Allowance for doubtful accounts and bad debts 0 (245) 245
Other $ 129 $ 220 $ 180