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Contract assets and liabilities (Details 1) ¥ in Thousands, $ in Thousands | Dec. 31, 2020 USD ($) | Dec. 31, 2020 CNY (¥) | Dec. 31, 2019 USD ($) | Dec. 31, 2019 CNY (¥)
--- | --- | --- | --- | ---
Costs and estimated earnings on uncompleted contracts | $ 1,904 |  | $ 5,150 |
Less: billings to date | (2,765) |  | (5,578) |
Costs and estimated earnings on uncompleted contracts in excess of billings | (861) |  | (428) |
Unbilled revenue | 202 |  | 441 |
Deferred revenue | $ (1,063) |  | $ (869) |
ZHEJIANG TIANLAN |  |  |  |
Costs and estimated earnings on uncompleted contracts | ¥ |  | ¥ 406,064 |  | ¥ 433,195
Less: billings to date | ¥ |  | (358,705) |  | (408,132)
Costs and estimated earnings on uncompleted contracts in excess of billings | ¥ |  | ¥ 47,359 |  | ¥ 25,063

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