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Stock Warrants (Tables)
 3 Months Ended
Mar. 31, 2015
Stock Warrants [Line Items]  
Summary of stock warrant activities
  Three months ended
March 31, 2015		 
  Number  Weight average
exercise price		 
Outstanding and exercisable at beginning of the period  820,312  $1.71 
Issued during the period  -   - 
Exercised during the period  -   - 
Cancelled or expired during the period  -   - 
Outstanding and exercisable at end of the period  820,312  $1.71 
Range of exercise price  $1.70 to $2.00 
Date of Issuance August 27, 2014 to September 2, 2019 [Member]  
Stock Warrants [Line Items]  
Fair value of warrants issued was estimated by using the Binominal pricing model
Terms of warrants  5 years
Expected volatility  72.0%
Risk-free interest rate  1.69%
Expected dividend yield  0.81%
Date of Issuance September 3, 2014 to June 26, 2019 [Member]  
Stock Warrants [Line Items]  
Fair value of warrants issued was estimated by using the Binominal pricing model
Terms of warrants  4.81 years
Expected volatility  69.8%
Risk-free interest rate  1.62%
Expected dividend yield  0.81%