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Note 9 - Non-recourse Long-term Debt, Net (Details Textual) - USD ($)
$ in Thousands
12 Months Ended 21 Months Ended
Nov. 04, 2016
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2019
Proceeds from Issuance of Long-term Debt, Total         $ 48,700  
Royalty-backed Loan [Member]            
Proceeds from Issuance of Long-term Debt, Total $ 50,000          
Debt Instrument, Interest Rate, Stated Percentage 9.50%          
Percentage of Royalty Payments in Excess of Accrued Loan Interest to be Applied to Principal           50.00%
Interest Expense, Total   $ 4,402 $ 4,962 $ 5,100