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Note 4 - Long-term Borrowings - Long-term Borrowings (Details) - USD ($) | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Long-term Debt, Gross | $ 1,595,000 |
Total | 2,023,000 | $ 2,234,000
Long-term Debt, Current Maturities, Total | 2,023,000 | 0
Non-current portion of long-term borrowing | 0 | 2,234,000
Notes Payable, Other Payables [Member] |  |
Long-term Debt, Gross | 1,595,000 | 1,995,000
Accrued in-kind interest – long term | 450,000 | 370,000
Debt instrument, unamortized discount | $ (22,000) | $ (131,000)

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