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Commitments and Contingent Liabilities (Tables)
12 Months Ended
Dec. 31, 2016
Commitments and Contingent Liabilities [Abstract]  
Schedule of future minimum lease commitments
   U.S. dollars in thousands 
 Years ending December 31:   
 2017 $528 
 2018  238 
 2019  44 
 2020  44 
 2021-2025  184 
   $1,038