Note 12 - Stockholders' Equity (Details) - Stock-Based Compensation Costs (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock—based compensation costs	$ 1,038	$ 670	$ 2,641	$ 2,090
Employee Stock-Based Compensation Costs [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock—based compensation costs	879	532	2,183	1,669
Director Stock-Based Compensation Costs [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock—based compensation costs	157	133	450	398
Employee Stock Purchase Plan [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock—based compensation costs	$ 2	$ 5	$ 8	$ 23