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v3.23.1

Related party transactions (Details Narrative) | 12 Months Ended
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Dec. 31, 2022 USD ($) | Dec. 31, 2022 CNY (¥) | Dec. 31, 2021 USD ($) | Dec. 31, 2021 CNY (¥) | Dec. 31, 2020 USD ($)
Proceeds from sale of long-term investment | $ | $ 0 |  | $ 0 |  | $ 148,000
Blue Sky |  |  |  |  |
Proceeds from sale of long-term investment | $ | $ 148,000 |  |  |  |
ZHEJIANG TIANLAN | Engineering Service |  |  |  |  |
Investment | ¥ |  |  |  | ¥ 273,000 |
Remuneration | ¥ |  | ¥ 1,083,000 |  | ¥ 1,209,000 |

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