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Note 3 - Long-term Borrowings - Long-term Borrowings (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Less unamortized discount and debt issuance costs   $ (22)
Long-Term Debt, Total $ 0 2,023
Current portion of long-term borrowing 0 2,023
Non-current portion of long-term borrowing 0 0
Notes Payable, Other Payables [Member]    
Notes Payable due July, 2022 0 1,595
Accrued in-kind interest – long term 0 $ 450
Less unamortized discount and debt issuance costs $ 0