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Contract assets and liabilities (Details 3) | Dec. 31, 2021 USD ($) | Dec. 31, 2021 CNY (¥) | Dec. 31, 2020 USD ($) | Dec. 31, 2020 CNY (¥)
--- | --- | --- | --- | ---
Costs and estimated earnings on uncompleted contracts | $ 228,000 |  | $ 1,904,000 |
Less: billings to date | (1,230,000) |  | (2,765,000) |
Costs incurred in contracts in process | 169,000 |  | 1,904,000 |
Costs and estimated earnings on uncompleted contracts in excess of billings | (1,002,000) |  | (861,000) |
Estimated earnings | (1,002,000) |  | (861,000) |
Unbilled revenue | 74,000 |  | 202,000 |
Deferred revenue | (1,076,000) |  | (1,063,000) |
ZHEJIANG TIANLAN |  |  |  |
Costs and estimated earnings on uncompleted contracts | ¥ |  | ¥ 503,434,000 |  | ¥ 406,064,000
Less: billings to date | ¥ |  | (468,605,000) |  | (358,705,000)
Costs and estimated earnings on uncompleted contracts in excess of billings | ¥ |  | 34,829,000 |  | 47,359,000
Unbilled revenue | ¥ |  | ¥ 72,310,000 |  | ¥ 94,494,000
ZHEJIANG TIANLAN |  |  |  |
Costs and estimated earnings on uncompleted contracts | 433,195,000 |  | 406,064,000 |
Costs and estimated earnings on uncompleted contracts in excess of billings | $ 25,063,000 |  | $ 47,359,000 |

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