Note 14 - Stock Repurchase Program (Details) - Stock Repurchase Program (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended			12 Months Ended
	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013
Stock Repurchase Program [Abstract]
Cumulative balance at January 1, 2014	1,309,355	987,591		663,802
Cumulative balance at January 1, 2014	$ 35.22	$ 33.92	$ 32.38	$ 31.06
Cumulative balance at January 1, 2014	$ 44,411	$ 31,973		$ 20,615
Shares Repurchased	212,035	321,764	323,789
Average Price Per Share	$ 43.29	$ 38.65	$ 35.08
Amount Repurchased	9,180	12,438	11,358
Shares Repurchased	1,521,390	1,309,355	987,591
Average Price Per Share	$ 35.22	$ 33.92	$ 32.38	$ 31.06
Amount Repurchased	$ 53,591	$ 44,411	$ 31,973