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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)