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Note 5 - Long-term Debt, Net - Long-term Debt (Details) (Parentheticals) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Refinanced Term Loan [Member]    
Long-term debt, unamortized discount $ 0 $ 2,386
The Credit Agreement [Member] | New Credit Facility Term Loan [Member]    
Long-term debt, unamortized discount 993 0
Promissory Notes [Member]    
Long-term debt, unamortized discount $ 0 $ 24