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Receivables and prepaid expenses
12 Months Ended
Dec. 31, 2016
Receivables and Prepaid Expenses [Abstract]  
Receivables and Prepaid Expenses Disclosure [Text Block]
3.
Receivables and prepaid expenses
 
 
 
December 31,
 
 
 
2016
 
2015
 
 
 
U.S. dollars in thousands
 
 
 
 
 
 
 
Government authorities
 
$
52
 
$
145
 
Prepaid expenses
 
 
611
 
 
915
 
 
 
 
 
 
 
 
 
 
 
$
663
 
$
1,060