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Note 17 - Accumulated Other Comprehensive Income (Tables)
12 Months Ended
Dec. 31, 2014
Disclosure Text Block [Abstract]  
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
   

Unrealized Losses

on Auction-Rate

Securities

   

Unrealized Gains

(Losses) on Other

Available-for-Sale

Securities

   

Foreign Currency

Translation

Adjustments

   

Total

 

Balance as of January 1, 2013

  $ (490 )   $ 37     $ 4,628     $ 4,175  

Other comprehensive income (loss) before reclassifications

    130       (29 )     1,988       2,089  

Amounts reclassified from accumulated other comprehensive income

    -       (4 )     -       (4 )

Net current period other comprehensive income (loss)

    130       (33 )     1,988       2,085  

Balance as of December 31, 2013

    (360 )     4       6,616       6,260  

Other comprehensive income (loss) before reclassifications

    179       (17 )     (609 )     (447 )

Amounts reclassified from accumulated other comprehensive income

    -       (2 )     -       (2 )

Net current period other comprehensive income (loss)

    179       (19 )     (609 )     (449 )

Balance as of December 31, 2014

  $ (181 )   $ (15 )   $ 6,007     $ 5,811