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Note 9 - Non-recourse Long-term Debt, Net - Summary of Royalty-backed Loan (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Current portion of debt, net $ 4,735   $ 2,445
Long-term debt, net 45,015   47,242
Royalty-backed Loan [Member]      
Outstanding principal balance, current portion 4,981   2,686
Unamortized debt discount, current portion (246)   (241)
Current portion of debt, net 4,735   2,445
Outstanding principal balance, long-term portion 45,771   48,066
Unamortized debt discount, long-term portion (756)   (824)
Long-term debt, net 45,015   $ 47,242
Interest expense 1,205 $ 1,192  
Non-cash interest expense 63 61  
Total interest expense included in interest (expense) income, net $ 1,268 $ 1,253