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Stock Warrants (Tables) | 12 Months Ended
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Dec. 31, 2018
Stock Warrants [Line Items] |
Summary of stock warrant activities |
|  | December 31, 2018 |  |  | December 31, 2017 |
|  | Number |  |  | Weight average exercise price |  |  | Number |  |  | Weight average exercise price |
Outstanding and exercisable at beginning of the year |  |  | 820,312 |  |  | $ | 1.71 |  |  |  | 820,312 |  |  | $ | 1.71 |
Issued during the year |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |
Exercised during the year |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |
Cancelled or expired during the year |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |
Outstanding and exercisable at end of the year |  |  | 820,312 |  |  | $ | 1.71 |  |  |  | 820,312 |  |  | $ | 1.71 |
Range of exercise price |  |  | $ 1.70 to $2.00 |  |  |  | $ 1.70 to $2.00 |
Date of issuance August 27, 2014 [Member] |
Stock Warrants [Line Items] |
Schedule fair value of warrants issued was 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 fair value of warrants issued was 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 | %

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