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Other accounts payable (Tables)
12 Months Ended
Dec. 31, 2016
Payables and Accruals [Abstract]  
Schedule of Accounts Payable and Accrued Liabilities [Table Text Block]
 
 
December 31,
 
 
 
2016
 
2015
 
 
 
U.S. dollars in thousands
 
 
 
 
 
 
 
Employees and payroll accruals
 
$
677
 
$
463
 
Accrued expenses
 
 
554
 
 
639
 
 
 
$
1,231
 
$
1,102