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Note 4 - Marketable Securities and Time Deposits (Tables)
9 Months Ended
Sep. 30, 2015
Investments, Debt and Equity Securities [Abstract]  
Available-for-sale Securities [Table Text Block]
   

Amortized cost

   

Unrealized gains (losses), net

   

Fair value

 
   

September 30,

2015

   

December 31,

2014

   

September 30,

2015

   

December 31,

2014

   

September 30,

2015

   

December 31,

2014

 
   

(Unaudited)

   

(Audited)

   

(Unaudited)

   

(Audited)

   

(Unaudited)

   

(Audited)

 
                                                 

Short term deposits

  $ 2,583     $ 2,599     $ -     $ -     $ 2,583     $ 2,599  

U.S. GSE securities

    23,594       21,085       39       (34 )     23,633       21,051  

Corporate obligations

    77,795       80,389       (47 )     (262 )     77,748       80,127  
                                                 
    $ 103,972     $ 104,072     $ (8 )   $ (296 )   $ 103,964     $ 103,777  
Investments Classified by Contractual Maturity Date [Table Text Block]
           

Unrealized gains (losses)

         
   

Amortized

cost

   

Gains

   

Losses

   

Fair value

 
                                 

Due in one year or less

  $ 17,677     $ 27     $ (2 )   $ 17,702  

Due after one year to five years

    86,295       149       (182 )     86,262  
                                 
    $ 103,972     $ 176     $ (184 )   $ 103,964