Note 13 - Capital Stock (Details) - USD ($)	1 Months Ended	3 Months Ended		9 Months Ended
	Mar. 31, 2016	Sep. 30, 2016	Mar. 31, 2016	Sep. 30, 2016	Sep. 30, 2015	Jun. 29, 2016
Class of Stock [Line Items]
Payments for Repurchase of Common Stock				$ 100,188,000	$ 202,000,000
Stock Repurchase Program, Authorized Amount						$ 125,000,000
Convertible Senior Notes Due 2017
Class of Stock [Line Items]
Convertible Debt, Termination of Capped Call Transaction, Number of Shares Received	200,000
Convertible Debt
Class of Stock [Line Items]
Debt Conversion, Converted Instrument, Shares Issued				17,000,000
First Quarter 2016 Repurchase Program [Member]
Class of Stock [Line Items]
Stock Repurchased During Period, Shares				9,400,000
Payments for Repurchase of Common Stock				$ 100,200,000
Accelerated Share Repurchases, Final Price Paid Per Share			$ 10.62
Stock Repurchase Program, Remaining Authorized Repurchase Amount		$ 0		0
Second Quarter 2016 Repurchase Program [Member]
Class of Stock [Line Items]
Stock Repurchased During Period, Shares		0
Stock Repurchase Program, Authorized Amount		$ 125,000,000		$ 125,000,000		$ 125,000,000