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Investments in Marketable Securities Available-for sale (Tables)
12 Months Ended
Dec. 31, 2012
Investments, Debt and Equity Securities [Abstract]  
Available-for-sale Securities [Table Text Block]

Following is a summary of marketable securities as of December 31, 2011 and 2012:

 

    December 31, 2011  
    Aggregate     Gross
Unrealized
    Gross
Unrealized
    Aggregate
Market
 
    Cost     Gains     Losses     Value  
    (in thousands)  
Time deposit with original maturities more than three months   $ 150       15       -       165  

 

    December 31, 2012  
    Aggregate     Gross
Unrealized
    Gross
Unrealized
    Aggregate
Market
 
    Cost     Gains     Losses     Value  
    (in thousands)  
Time deposit with original maturities more than three months   $ 150       22       -       172  
Schedule Of Information On Sales Of Available For Sale Marketable Securities [Table Text Block]

Information on sales of available for sale marketable securities for the years ended December 31, 2010, 2011 and 2012 is summarized below.

 

Period  

Proceeds
from sales

   

Gross

realized gains

   

Gross

realized losses

 
    (in thousands)  
                   
Year 2010   $ 33,443       326       (30 )
Year 2011   $ 25,834       420       (70 )
Year 2012   $ 19,612       35       (32 )