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4. Income taxes (Details Narrative) (USD $) | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Income Taxes Details Narrative |  |  |
Hong Kong profits tax rate for Euro Tech (Far East) Limited, Euro Tech (China) Limited and ChinaH2O.com Limited | 16.5 % | 16.5 % | 16.5 %
Assessable loss carried forward for Euro Tech Trading (Shanghai) Limited | $ 287,675 | $ 169,369 |
Assessable loss carried forward for Shanghai Euro Tech Limited | 482,340 | 387,543 |
Assessable loss carried forward for Shanghai Euro Tech Environmental Engineering Limited | 1,418,936 | 1,106,994 |
Expiration period for carryforwards | 5 years |  |
Shanghai Enterprise Income Tax rate for Yixing Pact Environmental Technology Co., Ltd | 25 % | 25 % | 25 %
PRC Enterprise Income Tax for variable interest entities of the Group | 25 % | 25 % | 25 %
Aggregate undistributed earnings of the Company’s subsidiaries located in the PRC intended to be reinvested for which no deferred taxation has been made for the PRC dividend withholding taxes | $ 1,900,000 |  |

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- Definition State the expiration dates of the tax credit carryforward. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 109 -Paragraph 48 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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