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Note 15 - Capital Stock (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended	3 Months Ended												6 Months Ended	12 Months Ended
	Mar. 31, 2016	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Jun. 30, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Aug. 16, 2018	Aug. 09, 2017	Jun. 29, 2016
Class of Stock [Line Items]
Payments for Repurchase of Common Stock															$ 50,053	$ 6	$ 100,188
Common Stock, Dividends, Per Share, Declared		$ 0.0025	$ 0.0025	$ 0.0025	$ 0.0025	$ 0.0025	$ 0.0025	$ 0.0025	$ 0.0025	$ 0.0025	$ 0.0025	$ 0.0025	$ 0.0025
Convertible Debt | Convertible Senior Notes Due 2017 and 2019
Class of Stock [Line Items]
Debt Conversion, Converted Instrument, Shares Issued	17,000,000.0
Convertible Debt | Convertible Senior Notes Due 2017
Class of Stock [Line Items]
Convertible Debt, Termination of Capped Call Transaction, Number of Shares Received	200,000
Third Quarter 2018 Repurchase Program
Class of Stock [Line Items]
Stock Repurchase Program, Authorized Amount																		$ 100,000
Stock Repurchase Program, Remaining Authorized Repurchase Amount		$ 100,000													100,000
Third Quarter 2017 Repurchase Program
Class of Stock [Line Items]
Stock Repurchase Program, Authorized Amount																			$ 50,000
Stock Repurchased During Period, Shares														3,000,000.0
Accelerated Share Repurchases, Final Price Paid Per Share														$ 16.56
Second Quarter 2016 Repurchase Program
Class of Stock [Line Items]
Stock Repurchase Program, Authorized Amount																				$ 125,000
Stock Repurchased During Period, Shares								380
Accelerated Share Repurchases, Final Price Paid Per Share								$ 15.59
First Quarter 2016 Repurchase Program
Class of Stock [Line Items]
Stock Repurchase Program, Remaining Authorized Repurchase Amount		$ 0													$ 0
Stock Repurchased During Period, Shares													9,400,000
Accelerated Share Repurchases, Final Price Paid Per Share													$ 10.62
Payments for Repurchase of Common Stock													$ 100,200

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Final price paid per share for the purchase of the targeted number of shares, determined by an average market price over a fixed period of time.

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Aggregate dividends declared during the period for each share of common stock outstanding.

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Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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