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Related party transactions (Details Narrative) | 12 Months Ended
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Dec. 31, 2021 USD ($) | Dec. 31, 2021 CNY (¥) | Dec. 31, 2020 USD ($) | Dec. 31, 2020 CNY (¥) | Dec. 31, 2019 USD ($)
Proceeds from sale of long-term investment | $ | $ 0 |  | $ 148,000 |  | $ 0
ZHEJIANG TIANLAN | Engineering Service |  |  |  |  |
Investment |  | ¥ 273,000 |  | ¥ 2,518,000 |
Remuneration |  | 1,209,000 |  | 1,400,000 |
Total consideration |  | ¥ 0 |  | ¥ 4,590,000 |
Blue Sky |  |  |  |  |
Proceeds from sale of long-term investment | $ |  |  | $ 148,000 |  |

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