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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%