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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, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Current portion of debt, net $ 8,216   $ 8,216   $ 2,445
Long-term debt, net 38,332   38,332   47,242
Royalty-backed Loan [Member]          
Outstanding principal balance, current portion 8,551   8,551   2,686
Unamortized debt discount, current portion (335)   (335)   (241)
Current portion of debt, net 8,216   8,216   2,445
Outstanding principal balance, long-term portion 38,834   38,834   48,066
Unamortized debt discount, long-term portion (502)   (502)   (824)
Long-term debt, net 38,332   38,332   $ 47,242
Interest expense 1,154 $ 1,205 3,535 $ 3,603  
Non-cash interest expense 92 62 229 172  
Total interest expense included in interest (expense) income, net $ 1,246 $ 1,267 $ 3,764 $ 3,775