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Accounts receivable net (Details 2) ¥ in Thousands, $ in Thousands | Dec. 31, 2023 USD ($) | Dec. 31, 2023 CNY (¥) | Dec. 31, 2022 USD ($) | Dec. 31, 2022 CNY (¥)
--- | --- | --- | --- | ---
Accounts receivable | $ 2,864 |  | $ 1,586 |
Current |  |  |  |
Accounts receivable | 1,175 |  | 710 |
1 - 30 Days Past Due |  |  |  |
Accounts receivable | 603 |  | 477 |
31 - 60 Days Past Due |  |  |  |
Accounts receivable | 548 |  | 311 |
61 - 90 Days Past Due |  |  |  |
Accounts receivable | 341 |  | 32 |
Greater Than or Equal to 91 Days |  |  |  |
Accounts receivable | 197 |  | 56 |
Past Due |  |  |  |
Accounts receivable | $ 1,689 |  | $ 876 |
ZHEJIANG TIANLAN |  |  |  |
Accounts receivable | ¥ |  | ¥ 128,235 |  | ¥ 135,773
ZHEJIANG TIANLAN | Within 1 year |  |  |  |
Accounts receivable | ¥ |  | 92,014 |  | 111,436
ZHEJIANG TIANLAN | 1year - 2 years Member |  |  |  |
Accounts receivable | ¥ |  | 31,499 |  | 12,236
ZHEJIANG TIANLAN | 2years - 3 years Member |  |  |  |
Accounts receivable | ¥ |  | 3,140 |  | 1,437
ZHEJIANG TIANLAN | 3years - 4 years Member |  |  |  |
Accounts receivable | ¥ |  | 699 |  | 6,132
ZHEJIANG TIANLAN | 4years - 5 years Member |  |  |  |
Accounts receivable | ¥ |  | ¥ 883 |  | ¥ 4,532

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