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Commitments (Tables)
 12 Months Ended
Dec. 31, 2018
Commitments  
Schedule of minimal future lease fees payable under office lease agreements

For the year ended December 31:  U.S. dollars in thousands 
2019   231 
2020   5 
Schedule of minimal future lease fees payable under vehicles lease agreements

For the year ended December 31:  U.S. dollars in thousands 
2019   89 
2020   47 
2021 and thereafter   12