Note 4 - Earnings Per Common Share (Details) - Components Used in Computation of Basic and Diluted Earnings Per Common Share (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Numerator:
Net income	$ 56,463	$ 43,136	$ 94,622	$ 64,960
Less: Net income allocated to preferred shareholder	(13,496)	(14,293)	(22,650)	(23,991)
Less: Net income allocated to unvested restricted stock	(77)	(66)	(134)	(82)
Net income available to common stockholders for basic earnings per common share	42,890	28,777	71,838	40,887
Effect of dilutive securities:
Net income allocated to preferred shareholder	13,496	14,293	22,650	23,991
Net income available to common and preferred stock for diluted earnings per share	56,427	43,111	94,692	65,082
Denominator:
Weighted average basic common shares outstanding (in Shares)	279,075,416	243,171,726	278,514,992	228,749,443
Weighted average additional common shares outstanding if preferred shares converted to common shares (if dilutive (in Shares)	87,812,786	120,779,819	87,812,786	134,221,626
Total weighted average common shares outstanding if preferred shares converted to common shares (in Shares)	366,888,202	363,951,545	366,327,778	362,971,069
Effect of dilutive securities:
Stock options and stock appreciation rights (in Shares)	6,339,326	7,224,120	6,624,087	7,211,767
Weighted average diluted shares outstanding (in Shares)	404,540,378	402,488,515	404,264,715	401,495,686
Income per common share:
Basic (in Dollars per share)	$ 0.15	$ 0.12	$ 0.26	$ 0.18
Diluted (in Dollars per share)	$ 0.14	$ 0.11	$ 0.23	$ 0.16
1.25% Convertible Senior Notes Due August 2032 [Member]
Effect of dilutive securities:
Interest on 1¼% convertible senior notes due 2032, included in cost of sales	$ 41	$ 41	$ 204	$ 204
Effect of dilutive securities:
1¼% convertible senior notes due 2032 (in Shares)	31,312,850	31,312,850	31,312,850	31,312,850