Note 1 - Description of Business and Summary of Significant Accounting Policies (Details) - Reconciliation of Basic Weighted-average Shares Outstanding to Diluted Weighted-average Shares Outstanding In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Reconciliation of Basic Weighted-average Shares Outstanding to Diluted Weighted-average Shares Outstanding [Abstract]
Weighted-average shares outstanding – basic	57,862	57,630	57,170
Weighted-average shares underlying stock options and restricted shares	502	342	92
Weighted-average shares outstanding - diluted	58,364	57,972	57,262