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EQUITY - Summary of stock option activities (Details 2) (Stock Options, USD $)
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12 Months Ended | ||
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Dec. 31, 2014
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Dec. 31, 2013
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Dec. 31, 2012
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Stock Options
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| Options | |||
| Outstanding at beginning of year | 548,366 | 586,566 | 498,566 |
| Granted | 203,200 | 153,000 | |
| Exercised | (2,818) | (100,000) | (12,000) |
| Cancelled | |||
| Forfeited | (228,200) | (91,200) | (32,166) |
| Outstanding at ending of year | 520,548 | 548,366 | 586,566 |
| Exercisable at the year end | 324,348 | 457,166 | 454,400 |
| Weighted average exercise price | |||
| Outstanding at beginning of year | $ 7.49 | $ 7.74 | $ 7.52 |
| Granted | $ 8.56 | $ 5.96 | |
| Exercised | $ 5.53 | $ 2.15 | $ 1.775 |
| Cancelled | |||
| Forfeited | |||
| Outstanding at the end of year | $ 7.95 | $ 7.49 | $ 7.74 |
| Exercisable at the year end | $ 7.74 | $ 7.74 | $ 7.56 |
| Weighted average grant-date fair value of options granted during the year | $ 8.56 | $ 5.96 | $ 8.34 |