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v3.25.1

Risk factors (Details Narrative) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2023 CNY (¥) | Dec. 31, 2023 CNY (¥)
ZHEJIANG TIANLAN | PRC |  |  |  |
Concentration of credit risk | ¥ |  |  | ¥ 500,000 |
Restricted cash | $ 67,750,000 |  |  | ¥ 128,000,000
Hong Kong and PRC [Member] |  |  |  |
Concentration of credit risk | 102,000 | $ 70,000 |  |
Restricted cash | $ 251,000 | $ 6,039,000 |  |

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