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Selected Statement of Operations Data (Tables)
 12 Months Ended
Dec. 31, 2018
Selected Statement of Operations Data [Abstract]  
Schedule of revenues classified by product lines
  Years ended December 31, 
  2 0 1 8  2 0 1 7  2 0 1 6 
  U.S. dollars in thousands 
          
Product line “A” $14,923  $14,722  $14,544 
Product line “B”  3,212   3,340   3,508 
  $18,135 $18,062  $18,052
Schedule of geographical revenues classified by geographical location of the customers
  Years ended December 31, 
  2 0 1 8  2 0 1 7  2 0 1 6 
  U.S. dollars in thousands 
          
United States $13,130 $12,995  $12,711 
Europe  3,328   3,181   3,333 
Israel  884   977   880 
Other  793   909   1,128 
  $18,135  $18,062  $18,052
Schedule of research and development expenses
  Years ended December 31, 
  2 0 1 8  2 0 1 7  2 0 1 6 
  U.S. dollars in thousands 
          
Payroll and related expenses $3,136 $2,788  $2,682 
Rent and related expenses  335   280   330 
Depreciation and amortization  34   37   53 
Subcontracting  87   165   307 
Other  155   147   145 
  $3,747 $3,417  $3,517
Schedule of selling and marketing expenses
  Years ended December 31, 
  2 0 1 8  2 0 1 7  2 0 1 6 
  U.S. dollars in thousands 
          
Payroll and related expenses $978 $953  $911 
Depreciation and amortization  6   5   5 
Travel and conventions  67   58   71 
Other  217   234   118 
  $1,268 $1,250  $1,105
Schedule of general and administrative expenses
  Years ended December 31, 
  2 0 1 8  2 0 1 7  2 0 1 6 
  U.S. dollars in thousands 
          
Payroll and related expenses $1,026 $1,105  $1,039 
Depreciation and amortization  15   16   18 
Insurance  36   42   50 
Office expenses  53   58   69 
Professional services  333   326   242 
Allowance for doubtful accounts and bad debts  -   -   (245)
Other  161   129   220 
  $1,624  $1,676  $1,393
Schedule of financial income (expense) - net
  Years ended December 31, 
  2 0 1 8  2 0 1 7  2 0 1 6 
  U.S. dollars in thousands 
Income:         
Interest on bank deposits and short-term investments $208  $75  $49 
Non-dollar currency gains - net  -   415   13 
Income from marketable securities  77   136   143 
Realized gain from sale of available-for-sale securities  28   -   - 
Interest on available-for-sale securities  27   42   58 
   340   668   263 
Expenses:            
Non-dollar currency losses - net  (107)  -   - 
Realized loss from sale of available-for-sale securities  -   (24)  (84)
Bank commissions and charges  (11)  (14)  (13)
   (118)  (38)  (97)
  $222  $630  $166
Schedule of earnings per ordinary share (''EPS'')
  Years ended December 31, 
  2 0 1 8  2 0 1 7  2 0 1 6 
  in thousands 
          
Weighted average number of shares issued and 
outstanding - used in computation of basic EPS		  19,344   19,292   19,234 
Add - incremental shares from assumed exercise of 
options		  217   267   73 
             
Weighted average number of shares used in 
computation of diluted EPS		  19,561   19,559   19,307