Note 3 - Stock Based Compensation (Details) - Allocated Share-based Compensation Expense (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Note 3 - Stock Based Compensation (Details) - Allocated Share-based Compensation Expense [Line Items]
Stock-based compensation expense	$ 1,665	$ 1,430	$ 4,994	$ 5,674
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	1,380	1,326	4,555	5,156
Restricted Stock [Member]
Note 3 - Stock Based Compensation (Details) - Allocated Share-based Compensation Expense [Line Items]
Stock-based compensation expense	$ 285	$ 104	$ 438	$ 518