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Contract assets and liabilities (Details 2) | Dec. 31, 2022 USD ($) | Dec. 31, 2022 CNY (¥) | Dec. 31, 2021 USD ($) | Dec. 31, 2021 CNY (¥)
--- | --- | --- | --- | ---
Contract assets: unbilled revenue | $ | $ 217,000 |  | $ 74,000 |
Contract liabilities: deferred revenue | $ | (625) |  | (1,076) |
Net contract (liabilities) / assets | $ | $ (408,000) |  | $ (1,002,000) |
ZHEJIANG TIANLAN |  |  |  |
Contract assets: unbilled revenue | ¥ |  | ¥ 76,992,000 |  | ¥ 72,310,000
Contract liabilities: deferred revenue | ¥ |  | (34,503) |  | (37,481,000)
Net contract (liabilities) / assets | ¥ |  | ¥ 42,489,000 |  | ¥ 34,829,000

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