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Note 17 - Accumulated Other Comprehensive Income (Tables)
12 Months Ended
Dec. 31, 2015
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, 2014

  $ (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  

Other comprehensive loss before reclassifications

    (28 )     (146 )     (4,166 )     (4,340 )

Amounts reclassified from accumulated other comprehensive income

    -       (5 )     -       (5 )

Net current period other comprehensive loss

    (28 )     (151 )     (4,166 )     (4,345 )

Balance as of December 31, 2015

  $ (209 )   $ (166 )   $ 1,841     $ 1,466