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Accounts receivable net (Details 2) $ in Thousands | Dec. 31, 2021 CNY (¥) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 CNY (¥) | Dec. 31, 2020 USD ($)
--- | --- | --- | --- | ---
Accounts receivable, net |  | $ 3,631 |  | $ 3,199
ZHEJIANG TIANLAN |  |  |  |
Accounts receivable, net | ¥ | ¥ 106,022,000 |  | ¥ 118,621,000 |
Current |  |  |  |
Accounts receivable, net |  | 1,441 |  | 2,014
1 - 30 Days Past Due |  |  |  |
Accounts receivable, net |  | 1,570 |  | 85
31 - 60 Days Past Due |  |  |  |
Accounts receivable, net |  | 495 |  | 202
61 - 90 Days Past Due |  |  |  |
Accounts receivable, net |  | 108 |  | 41
Greater Than or Equal to 91 Days |  |  |  |
Accounts receivable, net |  | 17 |  | 857
Past Due |  |  |  |
Accounts receivable, net |  | $ 2,190 |  | $ 1,185
Within 1 Year | ZHEJIANG TIANLAN |  |  |  |
Accounts receivable, net | ¥ | 85,534,000 |  | 76,590,000 |
1 year - 2 Years | ZHEJIANG TIANLAN |  |  |  |
Accounts receivable, net | ¥ | 12,144,000 |  | 31,389,000 |
2 Years - 3 Years | ZHEJIANG TIANLAN |  |  |  |
Accounts receivable, net | ¥ | 5,111,000 |  | 6,128,000 |
3 Years - 4 Years | ZHEJIANG TIANLAN |  |  |  |
Accounts receivable, net | ¥ | 5,141,000 |  | 3,678,000 |
4 Years - 5 Years | ZHEJIANG TIANLAN |  |  |  |
Accounts receivable, net | ¥ | ¥ 1,092,000 |  | ¥ 836,000 |

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