Note 3 - Stock Based Compensation (Details) - Allocated Share-based Compensation Expense (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Note 3 - Stock Based Compensation (Details) - Allocated Share-based Compensation Expense [Line Items]
Stock-based compensation expense	$ 2,047	$ 2,541	$ 3,331	$ 4,244
Stock Options and Employee Stock Purchase Plan (ESSP) [Member]
Note 3 - Stock Based Compensation (Details) - Allocated Share-based Compensation Expense [Line Items]
Stock-based compensation expense	1,954	2,191	3,175	3,830
Restricted Stock [Member]
Note 3 - Stock Based Compensation (Details) - Allocated Share-based Compensation Expense [Line Items]
Stock-based compensation expense	$ 92	$ 350	$ 153	$ 414