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Note 5 - Long-term Debt, Net - Long-term Debt (Details) (Parentheticals) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Refinanced Term Loan [Member]    
Long-term debt, unamortized discount $ 3,384 $ 3,715
Promissory Notes [Member]    
Long-term debt, unamortized discount $ 75 $ 100