Note 11 - Earnings Per Share (Details) - Dilutive Effect of Stock Options and Awards (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Dilutive Effect of Stock Options and Awards [Abstract]
Net Income (in Dollars)	$ 9,998	$ 10,331	$ 19,714	$ 20,443
Weighted-average number of basic shares outstanding during the period	19,795	19,706	19,799	19,625
Dilutive effect of stock options, restricted stock and RSUs	287	290	414	368
Weighted-average number of diluted shares outstanding during the period	20,082	19,996	20,213	19,993
Basic earnings per share (in Dollars per share)	$ 0.51	$ 0.52	$ 1.00	$ 1.04
Diluted earnings per share (in Dollars per share)	$ 0.50	$ 0.52	$ 0.98	$ 1.02