Note 14 - Stock Repurchase Program (Details) - Stock Repurchase Program - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended			12 Months Ended
	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014
Stock Repurchase Program [Abstract]
Shares Repurchased, Cumulative Balance	2,350	2,066	1,918	1,715
Average Price Per Share	$ 39.82	$ 38.70	$ 37.66	$ 36.04
Total Amount, Cumulative Balance	$ 93,548	$ 79,942	$ 72,218	$ 61,813
Repurchases	284	148	203
Repurchases, Average Price Per Share	$ 47.93	$ 52.19	$ 51.33
Repurchases, Total Amount	$ 13,606	$ 7,724	$ 10,405