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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2017
Accounting Policies [Abstract]  
Depreciation of Property, Plant and Equipment
Property, plant and equipment are stated at cost, net of accumulated depreciation. Depreciation is calculated on the straight-line basis over the estimated useful life of the assets at the following annual rates:
 
     
%
 
Machinery and equipment
15 - 33
 
Office furniture and equipment
6 - 33
 
Leasehold improvements
*
 
*  Over the shorter term of the lease or the life of the asset
Computation of Basic and Diluted Income Per Ordinary Share
The following table summarizes information related to the computation of basic and diluted income per ordinary share for the years indicated.
 
   
Year ended December 31
  
   
2015
    
2016
    
2017
  
Net income attributable to ordinary shares (US$ thousands)
    
16,520
      
13,137
      
21,714
  
                         
Weighted average number of ordinary shares outstanding used in basic income per ordinary share calculation
    
7,268,536
      
7,343,696
      
7,455,528
  
                         
Add assumed exercise of outstanding dilutive potential ordinary shares
    
99,448
      
91,485
      
146,443
  
                         
Weighted average number of ordinary shares outstanding used in diluted income per ordinary share calculation
    
7,367,984
      
7,435,181
      
7,601,971
  
                         
Basic income per ordinary shares (US$)
    
2.273
      
1.789
      
2.912
  
                         
Diluted income per ordinary shares (US$)
    
2.242
      
1.767
      
2.856
  
                         
The weighted average number of shares related  to options and RSUs excluded from the diluted earnings per share calculation because of anti-dilutive effect
    
43,181
      
9,633
      
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