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Accounts receivable net (Details 2) ¥ in Thousands, $ in Thousands | Dec. 31, 2022 USD ($) | Dec. 31, 2022 CNY (¥) | Dec. 31, 2021 USD ($) | Dec. 31, 2021 CNY (¥)
--- | --- | --- | --- | ---
Accounts receivable | $ 1,586 |  | $ 3,631 |
Current |  |  |  |
Accounts receivable | 710 |  | 1,441 |
1 - 30 Days Past Due |  |  |  |
Accounts receivable | 477 |  | 1,570 |
31 - 60 Days Past Due |  |  |  |
Accounts receivable | 311 |  | 495 |
61 - 90 Days Past Due |  |  |  |
Accounts receivable | 32 |  | 108 |
Greater Than or Equal to 91 Days |  |  |  |
Accounts receivable | 56 |  | 17 |
Past Due |  |  |  |
Accounts receivable | $ 876 |  | $ 2,190 |
ZHEJIANG TIANLAN |  |  |  |
Accounts receivable | ¥ |  | ¥ 135,773 |  | ¥ 106,022
ZHEJIANG TIANLAN | Within 1 year |  |  |  |
Accounts receivable | ¥ |  | 111,436 |  | 82,534
ZHEJIANG TIANLAN | 1 year - 2 years |  |  |  |
Accounts receivable | ¥ |  | 12,236 |  | 12,144
ZHEJIANG TIANLAN | 2 years - 3 years |  |  |  |
Accounts receivable | ¥ |  | 1,437 |  | 5,111
ZHEJIANG TIANLAN | 3 years - 4 years |  |  |  |
Accounts receivable | ¥ |  | 6,132 |  | 5,141
ZHEJIANG TIANLAN | 4 years - 5 years |  |  |  |
Accounts receivable | ¥ |  | ¥ 4,532 |  | ¥ 1,092

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