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Note 10 - Non-recourse Long-term Debt, Net - Summary of Royalty-backed Loan (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Current portion of debt, net $ 6,437   $ 6,437   $ 5,419
Long-term debt, net 34,489   34,489   39,180
Royalty-backed Loan [Member]          
Outstanding principal balance, current portion 6,679   6,679   5,688
Unamortized debt discount, current portion (242)   (242)   (269)
Current portion of debt, net 6,437   6,437   5,419
Outstanding principal balance, long-term portion 34,805   34,805   39,674
Unamortized debt discount, long-term portion (316)   (316)   (494)
Long-term debt, net 34,489   34,489   $ 39,180
Interest expense 1,016 $ 1,154 3,146 $ 3,535  
Non-cash interest expense 66 92 206 229  
Total interest expense included in interest (expense) income, net $ 1,082 $ 1,246 $ 3,352 $ 3,764