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Selected Statement of Operations Data (Details 6) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Income:      
Interest on bank deposits and short-term investments $ 49 $ 54 $ 151
Non-dollar currency gains - net 69 0 0
Income from marketable securities 143 102 148
Realized gain from sale of available-for-sale securities 0 0 38
Interest on available for sale securities 58 59 33
Other Nonoperating Income 319 215 370
Expenses:      
Non-dollar currency losses - net (56) (315) (663)
Realized loss from sale of available-for-sale securities (84) 0 0
Bank commissions and charges (13) (14) (13)
Other Nonoperating Expense (153) (329) (676)
Financial income (expense) - net $ 166 $ (114) $ (306)