Note 11 - Long-Term Debt Interest Expense Recognized Related to Convertible Debt (Details) (Convertible Debt [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Convertible Senior Notes Due 2017
Schedule of Interest Expense Recognized Related to Convertible Debt [Line Items]
Contractual interest expense of convertible debt	$ 2,351	$ 3,375	$ 6,750	$ 6,750
Amortization of debt issuance costs	304	287	604	570
Amortization of debt discount	5,312	4,826	10,498	9,538
Total interest expense for convertible debt	7,967	8,488	17,852	16,858
Debt Instrument, Interest Rate, Effective Percentage	9.75%	9.75%	9.75%	9.75%
Convertible Senior Notes Due 2019
Schedule of Interest Expense Recognized Related to Convertible Debt [Line Items]
Contractual interest expense of convertible debt	2,250	2,250	4,500	2,925
Amortization of debt issuance costs	319	308	635	400
Amortization of debt discount	2,934	2,758	5,823	3,577
Total interest expense for convertible debt	$ 5,503	$ 5,316	$ 10,958	$ 6,902
Debt Instrument, Interest Rate, Effective Percentage	6.25%	6.25%	6.25%	6.25%