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Income taxes (Details 1) | 12 Months Ended
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Dec. 31, 2021 USD ($) | Dec. 31, 2021 CNY (¥) | Dec. 31, 2020 USD ($) | Dec. 31, 2020 CNY (¥) | Dec. 31, 2019 USD ($) | Dec. 31, 2019 CNY (¥)
Income / (loss) before income taxes | $ | $ 1,276,000 |  | $ 498,000 |  | $ (173,000) |
Computed tax using respective companies' statutory tax rates | $ | 158,000 |  | 133,000 |  | 69,000 |
Change in valuation allowances | $ | 349,000 |  | 48,000 |  | 30,000 |
Under-provision for income taxes in prior years | $ | (12,000) |  | 0 |  | (5,000) |
Non-deductible expenses | $ | (405,000) |  | (277,000) |  | (131,000) |
Income taxes credit / (expense) at effective tax rate | $ | $ (90,000) |  | $ 96,000 |  | $ 37,000 |
ZHEJIANG TIANLAN |  |  |  |  |  |
Income / (loss) before income taxes |  | ¥ 12,880,000 |  | ¥ 15,358,000 |  | ¥ 4,654,000
Computed tax using respective companies' statutory tax rates |  | 1,932,000 |  | 2,304,000 |  | 642,000
Under-provision for income taxes in prior years |  | (39,000) |  | (48,000) |  | 0
Non-deductible expenses |  | 286,000 |  | 2,306,000 |  | 693,000
Income taxes credit / (expense) at effective tax rate |  | (698,000) |  | 1,858,000 |  | 296,000
Temporary differences |  | 401,000 |  | 182,000 |  | 202,000
Tax effect of special deduction for research and development costs |  | 3,263,000 |  | 3,001,000 |  | 2,103,000
Others |  | ¥ (15,000) |  | ¥ 115,000 |  | ¥ 862,000

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8933-108599 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8906-108599 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (f) -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8933-108599 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 20 -Section 25 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=126941158&loc=d3e41242-110953 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8736-108599 Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(10)) -URI https://asc.fasb.org/extlink&oid=126953954&loc=SL114868664-224227 Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(8)) -URI https://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 235 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-05(b)(2)) -URI https://asc.fasb.org/extlink&oid=120399901&loc=d3e537907-122884 Reference 9: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 31 -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8924-108599 Reference 10: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(15)) -URI https://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260 + Details
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