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Income taxes (Details 1) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 USD ($) | Dec. 31, 2023 CNY (¥) | Dec. 31, 2022 USD ($) | Dec. 31, 2022 CNY (¥) | Dec. 31, 2021 USD ($) | Dec. 31, 2021 CNY (¥)
Income before income tax | $ | $ 1,695 |  | $ 563 |  | $ 1,276 |
Hong Kong |  |  |  |  |  |
Income before income tax | $ | 1,695 |  | 563 |  | 1,276 |
Computed tax using respective companies' statutory tax rates | $ | 78 |  | 131 |  | 158 |
Tax effect of expenses not deductible for tax purposes | $ | (44) |  | (213) |  | (405) |
Change in valuation allowances | $ | (79) |  | 58 |  | 349 |
Under-provision for income taxes in prior years | $ | 0 |  | 0 |  | (12) |
Income taxes credit / (expense) at effective tax rate | $ | $ (45) |  | $ (24) |  | $ 90 |
ZHEJIANG TIANLAN |  |  |  |  |  |
Income before income tax |  | ¥ 86,606 |  | ¥ 15,398 |  | ¥ 12,880
Computed tax using respective companies' statutory tax rates |  | 12,991 |  | 2,309 |  | 1,932
(Over)-provision for income tax in prior years |  | 591 |  | 69 |  | 39
Temporary differences |  | 2,931 |  | 2,089 |  | 401
Tax effect of expenses not deductible for tax purposes |  | 4,472 |  | 500 |  | 286
Tax effect of special deduction for research and development costs |  | (3,734) |  | (5,257) |  | (3,263)
Tax effect of revenue not subject to tax |  |  |  | 3 |  | 0
Others |  |  |  | 57 |  | 15
Income taxes credit / (expense) at effective tax rate |  | ¥ 16,069 |  | ¥ (368) |  | ¥ (698)

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- Definition Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(11)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483586/944-220-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 22 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-22 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 30 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-30 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 32 -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-32 Reference 5: http://www.xbrl.org/2003/role/exampleRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 31 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-31 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 32 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-32 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 235 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-05(b)(2)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479557/942-235-S99-1 Reference 8: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 25 -Paragraph 1 -SubTopic 20 -Topic 940 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481913/940-20-25-1 Reference 9: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(10)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483621/220-10-S99-2 Reference 10: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(15)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483589/942-220-S99-1 + Details
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