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Selected Statement of Operations Data (Tables)
 12 Months Ended
Dec. 31, 2017
Selected Statement of Operations Data [Abstract]  
Schedule of revenues classified by product lines
   Years ended December 31, 
   2 0 1 7  2 0 1 6  2 0 1 5 
   U.S. dollars in thousands 
           
 Product line “A” $14,722  $14,544  $16,567 
 Product line “B”  3,340   3,508   4,361 
   $18,062  $18,052  $20,928 
Schedule of geographical revenues classified by geographical location of the customers
   Years ended December 31, 
   2 0 1 7  2 0 1 6  2 0 1 5 
   U.S. dollars in thousands 
           
 United States $12,995  $12,711  $11,292 
 United Kingdom  457   589   904 
 Rest of Europe  2,724   2,744   5,793 
 Israel  977   880   1,417 
 Other  909   1,128   1,522 
   $18,062  $18,052  $20,928 
Schedule of property and equipment - by geographical location
   December 31, 
   2 0 1 7  2 0 1 6 
   U.S. dollars in 
   thousands 
        
 Israel $85  $119 
 Romania  116   378 
 United States  1   1 
   $202  $498 
Schedule of research and development expenses
   Years ended December 31, 
   2 0 1 7  2 0 1 6  2 0 1 5 
   U.S. dollars in thousands 
           
 Payroll and related expenses $2,788  $2,682  $2,148 
 Rent and related expenses  280   330   321 
 Depreciation and amortization  37   53   72 
 Subcontracting  165   307   202 
 Other  147   145   200 
   $3,417  $3,517  $2,943 
Schedule of selling and marketing expenses
   Years ended December 31, 
   2 0 1 7  2 0 1 6  2 0 1 5 
   U.S. dollars in thousands 
           
 Payroll and related expenses $953  $911  $949 
 Depreciation and amortization  5   5   4 
 Travel and conventions  58   71   123 
 Other  234   118   97 
   $1,250  $1,105  $1,173 
Schedule of general and administrative expenses
   Years ended December 31, 
   2 0 1 7  2 0 1 6  2 0 1 5 
   U.S. dollars in thousands 
           
 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  -   (245)  245 
 Other  129   220   180 
   $1,676  $1,393  $1,766 
Schedule of financial income (expense) - net
   Years ended December 31, 
   2 0 1 7  2 0 1 6  2 0 1 5 
   U.S. dollars in thousands 
 Income:         
 Interest on bank deposits and short-term investments $75  $49  $54 
 Non-dollar currency gains - net  419   69   - 
 Income from marketable securities  136   143   102 
 Realized gain from sale of available-for-sale securities      -   - 
 Interest on available for sale securities  42   58   59 
    672   319   215 
 Expenses:            
 Non-dollar currency losses - net  (4)  (56)  (315)
 Realized loss from sale of available-for-sale securities  (24)  (84)  - 
 Bank commissions and charges  (14)  (13)  (14)
    (42)  (153)  (329)
              
   $630  $166  $(114)
Schedule of earnings per ordinary share (''EPS'')
   Years ended December 31, 
   2 0 1 7  2 0 1 6  2 0 1 5 
   U.S. dollars in thousands 
           
 Weighted average number of shares issued and outstanding - used in computation of basic EPS  19,292   19,234   19,183 
 Add - incremental shares from assumed exercise of 
options		  267   73   100 
              
 Weighted average number of shares used in computation of diluted EPS  19,559   19,307   19,283