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Accounts receivable, net (Details 1) ¥ in Thousands, $ in Thousands | Dec. 31, 2017 USD ($) | Dec. 31, 2017 CNY (¥) | Dec. 31, 2016 USD ($) | Dec. 31, 2016 CNY (¥)
--- | --- | --- | --- | ---
Accounts receivable | $ | $ 3,808 |  | $ 4,393 |
ZHEJIANG TIANLAN |  |  |  |
Accounts receivable |  | ¥ 180,518 |  | ¥ 165,100
Current |  |  |  |
Accounts receivable | $ | 1,816 |  | 1,789 |
30 - 59 days past due |  |  |  |
Accounts receivable | $ | 1,076 |  | 1,072 |
60 - 89 days past due |  |  |  |
Accounts receivable | $ | 288 |  | 852 |
Greater than 90 days past due |  |  |  |
Accounts receivable | $ | $ 628 |  | $ 680 |
Within 1 year | ZHEJIANG TIANLAN |  |  |  |
Accounts receivable |  | 128,413 |  | 118,476
1 year – 2 years | ZHEJIANG TIANLAN |  |  |  |
Accounts receivable |  | 37,934 |  | 31,340
2 years – 3 years | ZHEJIANG TIANLAN |  |  |  |
Accounts receivable |  | 9,158 |  | 9,387
3 years – 4 years | ZHEJIANG TIANLAN |  |  |  |
Accounts receivable |  | 2,270 |  | 4,593
4 years – 5 years | ZHEJIANG TIANLAN |  |  |  |
Accounts receivable |  | 893 |  | 240
Greater than 5 years | ZHEJIANG TIANLAN |  |  |  |
Accounts receivable |  | ¥ 1,850 |  | ¥ 1,064

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