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4. Income taxes (Details 2) In Thousands, unless otherwise specified | Dec. 31, 2012 USD ($) | Dec. 31, 2011 USD ($) | Dec. 31, 2012 ZHEJIANG CNY | Dec. 31, 2011 ZHEJIANG CNY
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The components of deferred tax assets are as follows: |  |  |  |
Tax losses | $ 977 | $ 811 | 0 | 348
Temporary differences | (24) | 1 |  |
Allowance for doubtful debts |  |  | 2,513 | 2,949
Less: Valuation allowances | (691) | (525) |  |
Net deferred tax assets | $ 262 | $ 287 | 2,513 | 3,297

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