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Other Receivables
12 Months Ended
Dec. 31, 2018
Receivables [Abstract]  
Other Receivables
Note 6 - Other Receivables
             
 
   
December 31
 
   
2017
   
2018
 
   
US$ thousands
 
             
Advances to suppliers
   
555
     
5,260
 
Government authorities
   
4,475
     
2,916
 
Prepaid expense
   
531
     
884
 
Other receivables
   
262
     
427
 
     
5,823
     
9,487