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Accounts Payable and Accruals (Tables)
 12 Months Ended
Dec. 31, 2018
Accounts payable and accruals:  
Schedule of accounts payable - other

   December 31 
   2018   2017 
   U.S. dollars in thousands 
         
Employees and related institutions   628    558 
Accrued expenses   323    319 
    951    877