Note 4 - Earnings Per Common Share (Detail) - Components Used in Computation of Basic and Diluted Earnings Per Common Share (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Numerator:
Net income	$ 21,824	$ 8,523
Less: Net income allocated to preferred shareholder	(8,903)	(3,674)
Less: Net income allocated to unvested restricted stock	(22)
Net income available to common stockholders for basic earnings per common share	12,899	4,849
Effect of dilutive securities:
Net income allocated to preferred shareholder	8,903	3,674
Interest on 1.25% convertible senior notes due 2032, included in cost of sales	41
Net income available to common and preferred stock for diluted earnings per share	$ 21,843	$ 8,523
Denominator:
Weighted average basic common shares outstanding (in Shares)	214,166,912	195,109,252
Weighted average additional common shares outstanding if preferred shares converted to common shares (if dilutive) (in Shares)	147,812,786	147,812,786
Total weighted average common shares outstanding if preferred shares converted to common shares (in Shares)	361,979,698	342,922,038
Effect of dilutive securities:
Stock options (in Shares)	7,467,654	4,764,725
1.25% convertible senior notes due 2032 (in Shares)	31,312,850
Weighted average diluted shares outstanding (in Shares)	400,760,202	347,686,763
Income per share:
Basic (in Dollars per share)	$ 0.06	$ 0.02
Diluted (in Dollars per share)	$ 0.05	$ 0.02