Note 12 - Stockholders' Equity (Details) - Stock-Based Compensation Costs (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock—based compensation costs	$ 921	$ 700	$ 1,603	$ 1,420
Employee Stock-Based Compensation Costs [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock—based compensation costs	763	661	1,304	1,137
Director Stock-Based Compensation Costs [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock—based compensation costs	155	32	293	265
Employee Stock Purchase Plan [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock—based compensation costs	$ 3	$ 7	$ 6	$ 18