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Commitments and contingencies (Details Narrative) | 12 Months Ended
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Dec. 31, 2021 CNY (¥) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 CNY (¥) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 CNY (¥)
Banking facilities available for overdraft and import and export credits |  | $ 897,000 |  | $ 897,000 |
Utilised for issuance of bank guarantees |  | 605,000 |  | $ 596,000 |
Secured by bank deposit |  | $ 897,000 |  |  |
Weighted average interest rate |  | 5.00% |  | 4.90% |
Bank borrowings |  | $ 219,000 |  | $ 457,000 |
Average interest rates | 5.00% | 5.00% | 4.90% | 4.90% |
ZHEJIANG TIANLAN |  |  |  |  |
Operating leases expense | ¥ | ¥ 0 |  | ¥ 0 |  | ¥ 0

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