Note 5 - Treasury Stock (Details Textual) - USD ($) $ / shares in Units, $ in Millions	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Feb. 28, 2014	Apr. 30, 2013
Stock Repurchased During Period, Shares	0	4,317,278
Stock Repurchase Program, Authorized Amount			$ 100.0	$ 50.0
Treasury Stock Acquired, Average Cost Per Share		$ 11.72
Stock Repurchase Program, Remaining Authorized Repurchase Amount	$ 42.7