Note 12 - Long-Term Debt Interest Expense Recognized Related to Convertible Debt (Details) - Convertible Debt [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Convertible Senior Notes Due 2017
Debt Instrument [Line Items]
Contractual interest expense of convertible debt	$ 872	$ 7,359
Amortization of debt discount	1,674	12,621
Amortization of debt issuance costs	88	696
Total interest expense for convertible debt	2,634	20,676
Convertible Senior Notes Due 2019
Debt Instrument [Line Items]
Contractual interest expense of convertible debt	3,426	8,925
Amortization of debt discount	5,016	12,487
Amortization of debt issuance costs	505	1,292
Total interest expense for convertible debt	$ 8,947	$ 22,704