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Financial income, net (Tables)
12 Months Ended
Dec. 31, 2016
Other Income and Expenses [Abstract]  
Schedule of Other Nonoperating Income (Expense) [Table Text Block]
Financial income, net are as follows:
 
 
 
Year Ended December 31,
 
 
 
2016
 
 
2015
 
 
2014
 
 
 
U.S. dollars in thousands
 
 
 
 
 
 
 
 
 
 
 
Interest income
 
$
90
 
 
$
186
 
 
$
85
 
Loss on foreign currency transactions, net
 
 
(22)
 
 
 
(39)
 
 
 
(21)
 
Other expenses
 
 
(8)
 
 
 
(12)
 
 
 
(6)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Total
 
$
60
 
 
$
135
 
 
$
58