Note 11 - Long-Term Debt Interest Expense Recognized Related to Convertible Debt (Details) - Convertible Debt [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Convertible Senior Notes Due 2017
Debt Instrument [Line Items]
Contractual interest expense of convertible debt	$ 7,359	$ 13,500
Amortization of debt issuance costs	696	1,226
Amortization of debt discount	12,621	21,512
Total interest expense for convertible debt	20,676	36,238
Convertible Senior Notes Due 2019
Debt Instrument [Line Items]
Contractual interest expense of convertible debt	8,925	9,000
Amortization of debt issuance costs	1,292	1,282
Amortization of debt discount	12,487	11,829
Total interest expense for convertible debt	$ 22,704	$ 22,111