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Risk factors (Details Narrative) | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2021 USD ($) | Dec. 31, 2021 CNY (¥) | Dec. 31, 2021 CNY (¥) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Restricted cash | $ | $ 1,411,000 |  |  | $ 1,672,000 | $ 729,000
Hong Kong |  |  |  |  |
Concentration of credit risk | $ | 64,000 |  |  |  |
Restricted cash | $ | $ 5,327,000 |  |  |  |
PRC |  |  |  |  |
Concentration of credit risk |  | ¥ 72,000 |  |  |
Restricted cash |  |  | ¥ 4,594,000 |  |
PRC | ZHEJIANG TIANLAN |  |  |  |  |
Concentration of credit risk |  | ¥ 44,494,000 |  |  |
Restricted cash |  |  | ¥ 48,855,000 |  |

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