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Accounts receivable net (Details) ¥ in Thousands, $ in Thousands | Dec. 31, 2021 CNY (¥) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 CNY (¥) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 CNY (¥) | Dec. 31, 2019 USD ($)
--- | --- | --- | --- | --- | --- | ---
Contract receivables | $ |  | $ 3,661 |  | $ 3,229 |  |
Less: allowance for doubtful accounts | $ |  | (30) |  | (30) |  | $ (36)
Accounts receivable, net | $ |  | $ 3,631 |  | $ 3,199 |  |
ZHEJIANG TIANLAN |  |  |  |  |  |
Contract receivables | ¥ | ¥ 148,889 |  | ¥ 160,803 |  |  |
Less: allowance for doubtful accounts | ¥ | (42,867) |  | (42,182) |  | ¥ (26,484) |
Accounts receivable, net | ¥ | ¥ 106,022 |  | ¥ 118,621 |  |  |

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