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Commitments and Contingent Liabilities (Tables)
12 Months Ended
Dec. 31, 2017
Commitments and Contingent Liabilities [Abstract]  
Schedule of future minimum lease commitments
   U.S. dollars in thousands 
 Years ending December 31:   
 2018 $503 
 2019  504 
 2020  213 
 2021  50 
 2022-2025  158 
   $1,428