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Risk factors (Details Narrative) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2022 USD ($) | Dec. 31, 2022 CNY (¥) | Dec. 31, 2022 CNY (¥) | Dec. 31, 2021 USD ($) | Dec. 31, 2021 CNY (¥)
Hong Kong |  |  |  |  |
Concentration of credit risk | $ | $ 64,000 |  |  |  |
Restricted cash | $ | $ 6,047,000 |  |  | $ 5,327,000 |
PRC |  |  |  |  |
Concentration of credit risk |  | ¥ 72,000 |  |  |
ZHEJIANG TIANLAN | PRC |  |  |  |  |
Concentration of credit risk |  | ¥ 500,000 |  |  |
Restricted cash |  |  | ¥ 115,282,000 |  | ¥ 48,855,000

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