Note 9 - Accumulated Other Comprehensive Income (Details) - Accumulated Balances of Other Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended				3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014 Available-for-sale Securities [Member]	Dec. 31, 2012 Available-for-sale Securities [Member]	Mar. 31, 2014 Auction Rate Securities [Member]	Mar. 31, 2013 Auction Rate Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Unrealized Gain (Loss) on Securities				$ 4		$ (360)
Foreign Currency Translation Adjustments		6,616
Total	6,260	6,260
Other comprehensive income (loss) before reclassifications			5		(17)
Other comprehensive income (loss) before reclassifications	(596)
Other comprehensive income (loss) before reclassifications	(608)
Net current period other comprehensive income (loss)	(17)		5		(17)	(15)
Net current period other comprehensive income (loss)	(596)
Net current period other comprehensive income (loss)	(608)	281
Unrealized Gain (Loss) on Securities			9	4	(377)
Foreign Currency Translation Adjustments	6,020
Total	$ 5,652