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Commitments and contingent liabilities (Tables)
12 Months Ended
Dec. 31, 2016
Commitments and Contingencies Disclosure [Abstract]  
Operating Leases of Lessee Disclosure [Table Text Block]
Future minimum non-cancelable payments under these lease agreements as of December 31, 2016, are as follows:
 
 
 
December 31,
 
 
 
2016
 
 
 
U.S. dollars in thousands
 
 
 
 
 
2017
 
$
113
 
2018
 
 
75
 
 
 
$
188