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Note 9 - Non-recourse Long-term Debt, Net (Details Textual) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Nov. 04, 2016
Dec. 31, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Proceeds from Issuance of Long-term Debt, Total     $ 48,650
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, Debt, Total     $ 5,000 $ 5,100