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v3.25.1

Summary of significant accounting policies (Details Narrative) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2024 USD ($) shares | Dec. 31, 2024 CNY (¥) | Dec. 31, 2023 USD ($) shares | Dec. 31, 2023 CNY (¥) | Dec. 31, 2022 USD ($) | Dec. 31, 2022 CNY (¥) | Mar. 03, 2021 shares | Oct. 08, 2019 shares
Research and development costs | $ 0 |  | $ 0 |  | $ 0 |  |  |
Advertising and promotional expenses | $ 41,000 |  | $ 29,000 |  | $ 9,000 |  |  |
Common stock, issued | shares | 7,899,832 |  | 7,899,832 |  |  |  | 2,061,900 | 1,030,950
Remaining performance obligation | $ 4,022,000 |  | $ 3,839,000 |  |  |  |  |
Revenue from Contract with Customer, Increase (Decrease) | $ 183,000 |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |
Concentration percentage | 47.00% | 47.00% | 41.00% | 41.00% | 33.00% | 33.00% |  |
ZHEJIANG TIANLAN |  |  |  |  |  |  |  |
Research and development costs | ¥ |  | ¥ 27,371,000 |  | ¥ 20,452,000 |  | ¥ 29,115,000 |  |
Impairment of long-lived assets | $ 0 |  |  | ¥ 0 | $ 0 |  |  |
Common stock, issued | shares | 82,572,000 |  | 82,572,000 |  |  |  |  |
ZHEJIANG TIANLAN | Revenue |  |  |  |  |  |  |  |
Concentration percentage | 42.00% | 42.00% | 38.00% | 38.00% | 35.00% | 35.00% |  |
ZHEJIANG TIANLAN | Revenue | Customer One |  |  |  |  |  |  |  |
Concentration percentage | 16.00% | 16.00% | 22.00% | 22.00% | 14.00% | 14.00% |  |

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