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Note 3 - Long-term Borrowings - Long-term Borrowings (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Total $ 2,079 $ 2,028
Current portion of long-term borrowing
Non-current portion of long-term borrowing 2,079 2,028
Notes Payable, Other Payables [Member]    
Notes Payable due July 2022 1,995 1,995
Accrued interest – long term 283 255
Debt instrument, unamortized discount $ (199) $ (222)