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FAIR VALUE MEASUREMENT (Details 2) (Not designated as hedging instruments, USD $) | Dec. 31, 2012 | Dec. 31, 2011
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Effect of fair values of derivative instruments on the consolidated balance sheets |  |
Total derivatives asset | $ 1,350,657 | $ 2,726,538
Total derivatives liability | 365,226 |
Foreign exchange option contracts |  |
Effect of fair values of derivative instruments on the consolidated balance sheets |  |
Total derivatives asset | 100,837 | 479,333
Foreign exchange forward contracts |  |
Effect of fair values of derivative instruments on the consolidated balance sheets |  |
Total derivatives asset | 1,249,820 | 2,247,205
Total derivatives liability | $ 365,226 |

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