Note 2 - Cash, Cash Equivalents and Investments (Details) - Level 3 Investments (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Level 3 Investments [Abstract]
Ending Balances	$ 11,755	$ 13,675
Sales and Settlement at Par	(2,025)	(2,100)
Realized gain included in interest and other income, net		40
Change in unrealized gain (loss) on available-for-sale securities	130	140
Ending Balances	$ 9,860	$ 11,755