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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 |

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