Note 2 - Stock-Based Compensation (Detail) - Stock Based Compensation Plan Expenses (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Stock Based Compensation Expense	$ 3,829	$ 3,675	$ 7,144	$ 6,662
Non Employee [Member]
Stock Based Compensation Expense	6	4	11	8
Employee Stock Purchase Program [Member]
Stock Based Compensation Expense	179	150	390	302
Restricted Stock [Member]
Stock Based Compensation Expense	2,881	2,057	5,061	3,220
Stock Options [Member]
Stock Based Compensation Expense	$ 763	$ 1,464	$ 1,682	$ 3,132