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Note 7 - Long-term investment (Details) | Dec. 31, 2024 USD ($) | Mar. 29, 2021 USD ($) | Mar. 29, 2021 CNY (¥) | Mar. 29, 2021 CNY (¥)
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Haitianhuineng |  |  |  |
Equity Method Investments |  | $ 0.2 |  |
Equity Method Investment, Ownership Percentage |  | 4.56% |  | 4.56%
Payments to Acquire Equity Method Investments |  | $ 0.2 |  |
Haitianhuineng | RMB |  |  |  |
Equity Method Investments | ¥ |  |  |  | ¥ 1.5
Payments to Acquire Equity Method Investments | ¥ |  |  | ¥ 1.5 |
Qingdao Tungray Intelligent Technology Co., Ltd |  |  |  |
Equity Method Investments | $ 200,000 |  |  |
Equity Method Investment, Ownership Percentage | 100.00% |  |  |
Other than Temporary Impairment Losses, Investments | $ 0 |  |  |

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