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Stock Warrants (Tables)
 3 Months Ended
Mar. 31, 2019
Stock Warrants [Line Items]  
Schedule of stock warrant activities

  

Three Months Ended

March 31, 2019

 
   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 [Member]  
Stock Warrants [Line Items]  
Schedule of fair value of warrants issued estimated by using 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 from September 3, 2014 to June 26, 2019 [Member]  
Stock Warrants [Line Items]  
Schedule of fair value of warrants issued estimated by using Binominal pricing model

Terms of warrants   4.81 years 
Expected volatility   69.8 
Risk-free interest rate   1.62 
Expected dividend yield   0.81