Note 8 - Equity (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Jul. 30, 2015
Preferred Stock, Shares Issued	0	0
Stock Repurchase Program, Authorized Amount				$ 75,000
Payments for Repurchase of Common Stock	$ 50,000		$ 25,000
Preferred Stock, Shares Authorized	5,000,000	5,000,000