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		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Convertible Senior Notes Due 2017
Schedule of Interest Expense Recognized Related to Convertible Debt [Line Items]
Contractual interest expense of convertible debt	$ 3,375	$ 3,375	$ 10,125	$ 10,125
Amortization of debt issuance costs	308	291	912	861
Amortization of debt discount	5,441	4,943	15,939	14,481
Total interest expense for convertible debt	9,124	8,609	26,976	25,467
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	6,750	5,175
Amortization of debt issuance costs	322	311	957	711
Amortization of debt discount	2,980	2,801	8,803	6,378
Total interest expense for convertible debt	$ 5,552	$ 5,362	$ 16,510	$ 12,264
Debt Instrument, Interest Rate, Effective Percentage	6.25%	6.25%	6.25%	6.25%