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Income taxes (Details Narrative) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Aggregate undistributed earnings | $ 600,000 | $ 600,000 | $ 600,000 |
Income tax rate | 10.00% |  |  |
Assessable profits/loss | $ 1,366,000 | $ 402,000 | $ (210,000) |
Hong Kong |  |  |  |
Income tax rate | 8.25% | 16.50% | 16.50% |
Assessable profits/loss | $ 256,000 | $ 256,000 |  |
Shanghai Euro Tech Limited |  |  |  |
Income tax rate |  | 25.00% | 25.00% |
Assessable profits/loss | (678,000) | $ (658,733) | $ (444,192) |
Shanghai Euro Tech Environmental Engineering Company Limited |  |  |  |
Income tax rate |  | 25.00% | 25.00% |
Assessable profits/loss | 0 |  | $ (34,032) | $ (380,591)
Yixing Pact Environmental Technology Co. Ltd. |  |  |  |
Income tax rate |  | 25.00% | 25.00% |
Assessable profits/loss | 1,759,000 | $ 2,304,828 | $ 1,664,275 |
Euro Tech Trading (Shanghai) Limited |  |  |  |
Income tax rate |  | 25.00% | 25.00% |
Assessable profits/loss | $ (18,000) | $ (604,778) | $ (518,328) |

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