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Note 3 - Fair Value of Financial Instruments (Tables)
6 Months Ended
Jun. 30, 2014
Fair Value Disclosures [Abstract]  
Fair Value Measurements, Recurring and Nonrecurring [Table Text Block]

June 30, 2014

 

Level 1

   

Level 2

   

Level 3

   

Total

 

Cash equivalents:

                               

Money market funds

  $ 2,749     $     $     $ 2,749  

Commercial paper

          2,999             2,999  

Marketable investments:

                               

Available-for-sale securities

          70,696             70,696  

Total assets at fair value

  $ 2,749     $ 73,695     $     $ 76,444  

December 31, 2013

 

Level 1

   

Level 2

   

Level 3

   

Total

 

Cash equivalents:

                               

Money market funds

  $ 9,926     $     $     $ 9,926  

Commercial paper

          2,500             2,500  

Marketable investments:

                               

Available-for-sale securities

          66,831             66,831  

Total assets at fair value

  $ 9,926     $ 69,331     $     $ 79,257