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Note 4 - Marketable Securities and Time Deposits (Tables)
3 Months Ended
Mar. 31, 2016
Investments, Debt and Equity Securities [Abstract]  
Available-for-sale Securities [Table Text Block]
   

Amortized cost

   

Unrealized gains (losses), net

   

Fair value

 
   

March 31,

2016

   

December 31,

2015

   

March 31,

2016

   

December 31,

2015

   

March 31,

2016

   

December 31,

2015

 
   

(Unaudited)

   

(Audited)

   

(Unaudited)

   

(Audited)

   

(Unaudited)

   

(Audited)

 
                                                 

Short term deposits

    5,674     $ 5,568     $ -     $ -     $ 5,674     $ 5,568  

U.S. GSE securities

    22,562       23,645       (35 )     (114 )     22,527       23,531  

Corporate obligations

    76,756       79,072       (27 )     (387 )     76,729       78,685  
                                                 
    $ 104,992     $ 108,285     $ (62 )   $ (501 )   $ 104,930     $ 107,784  
Investments Classified by Contractual Maturity Date [Table Text Block]
           

Unrealized gains (losses)

         
   

Amortized

cost

   

Gains

   

Losses

   

Fair value

 
                                 

Due in one year or less

  $ 19,015     $ 16     $ (3 )   $ 19,028  

Due after one year to five years

    85,977       190       (265 )     85,902  
                                 
    $ 104,992     $ 206     $ (268 )   $ 104,930