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Selected Statement of Operations Data (Details 6) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income:      
Interest on bank deposits and short-term investments $ 75 $ 49 $ 54
Non-dollar currency gains - net 419 69 0
Income from marketable securities 136 143 102
Realized gain from sale of available-for-sale securities   0 0
Interest on available for sale securities 42 58 59
Other Nonoperating Income 672 319 215
Expenses:      
Non-dollar currency losses - net (4) (56) (315)
Realized loss from sale of available-for-sale securities (24) (84) 0
Bank commissions and charges (14) (13) (14)
Other Nonoperating Expense (42) (153) (329)
Financial income (expense) - net $ 630 $ 166 $ (114)