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Note 13 - Accumulated Other Comprehensive Income (Tables)
9 Months Ended
Sep. 30, 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, 2015

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

Other comprehensive income before reclassifications

    5       32       249       286  

Amounts reclassified from accumulated other comprehensive income

    -       (1 )     -       (1 )

Net current period other comprehensive income

    5       31       249       285  

Balance as of March 31, 2015

    (176 )     16       6,256       6,096  

Other comprehensive income (loss) before reclassifications

    (19 )     7       105       93  

Amounts reclassified from accumulated other comprehensive income

    -       (3 )     -       (3 )

Net current period other comprehensive income (loss)

    (19 )     4       105       90  

Balance as of June 30, 2015

    (195 )     20       6,361       6,186  

Other comprehensive income (loss) before reclassifications

    (11 )     42       (3,132 )     (3,101 )

Amounts reclassified from accumulated other comprehensive income

    -       (1 )     -       (1 )

Net current period other comprehensive income (loss)

    (11 )     41       (3,132 )     (3,102 )

Balance as of September 30, 2015

  $ (206 )   $ 61     $ 3,229     $ 3,084