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Note 3 - Long-term Borrowings - Long-term Borrowings (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Long-term borrowings, gross | $ 2,042 |
| 1,656 | $ 1,071
Current portion of long-term borrowing |  | (246)
Non-current portion of long-term borrowing | 1,656 | 825
Convertible Debt [Member] |  |
Long-term borrowings, gross |  | 250
Debt instrument, unamortized discount |  | (4)
Notes Payable, Other Payables [Member] |  |
Long-term borrowings, gross | 1,995 | 945
Debt instrument, unamortized discount | (386) | (120)
Accrued interest – long term | $ 47 |

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