Note 10 - Stock Repurchase Program (Details) - Stock Repurchase Program (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended	12 Months Ended
	Jun. 30, 2014	Mar. 31, 2014	Jun. 30, 2014	Dec. 31, 2013
Stock Repurchase Program [Abstract]
Cumulative balance at January 1, 2014	987,591			663,802
Cumulative balance at January 1, 2014	$ 33.92	$ 32.38		$ 31.06
Cumulative balance at January 1, 2014	$ 31,973			$ 20,615
	321,764	323,789
	$ 38.65	$ 35.08
	12,438	11,358	23,796
Shares Repurchased	1,309,355	987,591	1,309,355
Average Price Per Share	$ 33.92	$ 32.38		$ 31.06
Amount Repurchased	$ 44,411	$ 31,973	$ 44,411