Note 9 - Non-recourse Long-term Debt, Net - Summary of Royalty-backed Loan (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Current portion of debt, net	$ 1,839		$ 1,839
Long-term debt, net	47,786		47,786		49,453
Royalty-backed Loan [Member]
Outstanding principal balance	2,083		2,083
Unamortized debt discount	(244)		(244)
Current portion of debt, net	1,839		1,839
Outstanding principal balance, long-term portion	48,669		48,669		50,765
Unamortized debt discount, long-term portion	(883)		(883)		(1,312)
Long-term debt, net	47,786		47,786		$ 49,453
Interest expense	1,205		3,603
Non-cash interest expense	62		172
Total interest expense included in interest (expense) income, net	$ 1,267		$ 3,775