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Note 3 - Long-term Borrowings - Long-term Borrowings (Details) - USD ($)
Jun. 30, 2022
Dec. 31, 2021
Debt instrument, unamortized discount   $ (22,000)
Total $ 2,044,000 2,023,000
Long-Term Debt, Current Maturities, Total 2,044,000 2,023,000
Non-current portion of long-term borrowing 0 0
Notes Payable, Other Payables [Member]    
Notes Payable due July 2022 1,595,000 1,595,000
Accrued in-kind interest – long term 449,000 $ 450,000
Debt instrument, unamortized discount $ 0