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Stock Warrants (Tables)
 6 Months Ended
Jun. 30, 2016
Stock Warrants [Line Items]  
Summary of stock warrant activities
  

Six months ended

June 30, 2016

 
  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%