Note 10 - Long-Term Debt Interest Expense Recognized Related to Convertible Debt (Details) (Convertible Debt [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Convertible Senior Notes Due 2017
Schedule of Interest Expense Recognized Related to Convertible Debt [Line Items]
Contractual interest expense of convertible debt	$ 4,399	$ 3,375
Amortization of debt issuance costs	300	283
Amortization of debt discount	5,186	4,712
Total interest expense for convertible debt	9,885	8,370
Debt Instrument, Interest Rate, Effective Percentage	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	675
Amortization of debt issuance costs	316	92
Amortization of debt discount	2,889	819
Total interest expense for convertible debt	$ 5,455	$ 1,586
Debt Instrument, Interest Rate, Effective Percentage	6.25%	6.25%