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Supplementary Balance Sheet Information (Tables)
 12 Months Ended
Dec. 31, 2018
Supplementary Balance Sheet Information [Abstract]  
Schedule of cash cash equivalents and deposits
    December 31,  
    2 0 1 8     2 0 1 7  
    U.S. dollars in  
    thousands  
             
Cash   $ 1,389   $ 2,744  
Cash equivalents     314       159  
Total cash   $ 2,739     $ 5,014  
                 
Short term deposits (a)   $ 8,714     $ 6,102  
                 
Long term deposit (b)   $ 98     $ 101  
Total   $ 11,551     $ 11,217  

 

(a) The average rate of short-term deposits is 2.92%.
(b) The deposit maturity is June 2020 and the rate is 1.8%.
Schedule of accounts receivable, other
  December 31, 
  2 0 1 8  2 0 1 7 
  U.S. dollars in 
  thousands 
       
Government $227 $659 
Employees  19   25 
Sundry  314   159 
  $560  $843
Schedule of accounts payable and accruals - other
  December 31, 
  2 0 1 8  2 0 1 7 
  U.S. dollars in 
  thousands 
       
Payroll and related expenses $899 $507 
Government institutions  218   208 
Accrued vacation pay  79   52 
Accrued expenses and sundry  305   70 
  $1,501 $837