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Note 6 - Long-term Loans (Details Textual) $ in Thousands, ¥ in Millions |  |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
May 03, 2020 USD ($) | Mar. 28, 2019 USD ($) | Mar. 31, 2022 USD ($) | Mar. 31, 2022 CNY (¥) | Jul. 31, 2021 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Mar. 28, 2019 CNY (¥)
Gain (Loss) on Extinguishment of Debt, Total |  |  |  |  |  | $ (0) | $ (0) | $ 635 |
Term Loan [Member] | China Construction Bank [Member] |  |  |  |  |  |  |  |  |
Debt Instrument, Term (Year) |  | 3 years |  |  |  |  |  |  |
Long-term Debt, Total |  | $ 1,493 |  |  |  |  |  |  | ¥ 10
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  | 5.25% |
Repayments of Long-Term Debt, Total |  |  | $ 1,569 | ¥ 10 |  |  |  |  |
Paycheck Protection Program CARES Act [Member] |  |  |  |  |  |  |  |  |
Debt Instrument, Term (Year) | 2 years |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 1.00% |  |  |  |  |  |  |  |
Proceeds from Issuance of Long-term Debt, Total | $ 635 |  |  |  |  |  |  |  |
Paycheck Protection Program CARES Act [Member] | Other Nonoperating Income (Expense) [Member] |  |  |  |  |  |  |  |  |
Gain (Loss) on Extinguishment of Debt, Total |  |  |  |  | $ 635 |  |  |  |

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