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Accounts receivable, net (Details 2) ¥ in Thousands, $ in Thousands | Dec. 31, 2020 USD ($) | Dec. 31, 2020 CNY (¥) | Dec. 31, 2019 USD ($) | Dec. 31, 2019 CNY (¥)
--- | --- | --- | --- | ---
Accounts receivable | $ 3,199 |  | $ 3,586 |
ZHEJIANG TIANLAN |  |  |  |
Accounts receivable | ¥ |  | ¥ 118,621 |  | ¥ 138,778
Current |  |  |  |
Accounts receivable | 2,014 |  | 1,495 |
1 - 30 Days Past Due |  |  |  |
Accounts receivable | 85 |  | 41 |
31 - 60 Days Past Due |  |  |  |
Accounts receivable | 202 |  | 1,343 |
61 - 90 Days Past Due |  |  |  |
Accounts receivable | 41 |  | 99 |
Greater Than or Equal to 91 Days |  |  |  |
Accounts receivable | 857 |  | 608 |
Past Due |  |  |  |
Accounts receivable | $ 1,185 |  | $ 2,091 |
Within 1 Year | ZHEJIANG TIANLAN |  |  |  |
Accounts receivable | ¥ |  | 76,590 |  | 96,456
1 year - 2 Years | ZHEJIANG TIANLAN |  |  |  |
Accounts receivable | ¥ |  | 31,389 |  | 30,252
2 Years - 3 Years | ZHEJIANG TIANLAN |  |  |  |
Accounts receivable | ¥ |  | 6,128 |  | 6,260
3 Years - 4 Years | ZHEJIANG TIANLAN |  |  |  |
Accounts receivable | ¥ |  | 3,678 |  | 5,179
4 Years - 5 Years | ZHEJIANG TIANLAN |  |  |  |
Accounts receivable | ¥ |  | ¥ 836 |  | ¥ 631

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