Note 2 - Stock-Based Compensation (Detail) - Stock Based Compensation Plan Expenses (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Stock Based Compensation Expense	$ 4,182	$ 3,374	$ 11,326	$ 10,036
Non Employee [Member]
Stock Based Compensation Expense	6	2	17	10
Employee Stock Purchase Program [Member]
Stock Based Compensation Expense	88	99	478	401
Restricted Stock [Member]
Stock Based Compensation Expense	3,447	2,058	8,508	5,278
Stock Options [Member]
Stock Based Compensation Expense	$ 641	$ 1,215	$ 2,323	$ 4,347