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15. STOCK OPTIONS AND WARRANTS (Details) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Risk-free interest rates   1.80%
Expected life 5 years 5 years
Expected volatility 25.00% 25.00%
Dividend yield      
Weighted-average grant date fair value per share $ 1.31 $ 0.76
Maximum
   
Risk-free interest rates 0.66%  
Minimum
   
Risk-free interest rates 0.73%