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Contract assets and liabilities (Details 3) ¥ in Thousands, $ in Thousands | Dec. 31, 2023 USD ($) | Dec. 31, 2023 CNY (¥) | Dec. 31, 2022 USD ($) | Dec. 31, 2022 CNY (¥)
--- | --- | --- | --- | ---
Costs incurred in contracts in process | $ 229 |  | $ 682 |
Revenue earned but not yet billed | 26 |  | 68 |
Less: billings to date | (839) |  | (1,158) |
Less: billings to date | 839 |  | 1,158 |
Unbilled revenue | $ (584) |  | $ (408) |
ZHEJIANG TIANLAN |  |  |  |
Costs and estimated earnings on uncompleted contracts | ¥ |  | ¥ 239,648 |  | ¥ 688,184
Less: billings to date | ¥ |  | (210,220) |  | (645,695)
Less: billings to date | ¥ |  | 210,220 |  | 645,695
Unbilled revenue | ¥ |  | ¥ 29,428 |  | ¥ 42,489

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