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v3.23.1

Accounts receivable net (Details 1) | 12 Months Ended
--- | ---
Dec. 31, 2022 CNY (¥) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 CNY (¥) | Dec. 31, 2021 USD ($)
Balance at beginning of period | $ |  | $ 30,000 |  | $ 30,000
Less: reversal of provision for doubtful accounts | $ |  | (2,000) |  | 0
Balance at end of period | $ |  | $ 28,000 |  | 30,000
ZHEJIANG TIANLAN |  |  |  |
Balance at beginning of period | ¥ 42,867,000 |  | ¥ 42,182,000 |
Less: reversal of provision for doubtful accounts | (2,687,000) |  | 0 |
Balance at end of period | 40,019,000 |  | 42,867,000 |
Add: provision for allowances | 822 |  |  | $ 868
Less: reversal of provision for doubtful accounts | ¥ (983,000) |  | ¥ (183,000) |

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