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WARRANT LIABILITY | 12 Months Ended
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Dec. 31, 2020
Note 16 - WARRANT LIABILITY | The Company’s warrant liability arises as a result of the issuance of warrants exercisable in US dollars. As the denomination is different from the Canadian dollar functional currency of the entity issuing the underlying shares, the Company recognizes a derivative liability for these warrants and re-measures the liability at the end of each reporting period using the Black-Scholes model. Changes in respect of the Company’s warrant liability are as follows:
|  | December 31, 2020 |  |  | December 31, 2019 |
Balance at beginning of the period |  | $ | 1,579 |  |  | $ | 2,009 |
Fair value adjustment |  |  | 650 |  |  |  | (520 | )
Effect of movement in exchange rates |  |  | 66 |  |  |  | 90 |
Balance at end of the period |  | $ | 2,295 |  |  | $ | 1,579 |
Continuity of warrants during the periods is as follows:
|  | Underlying Shares |  |  | Weighted Average Exercise Price |
Warrants outstanding and exercisable, January 1, 2019 |  |  | 10,778,061 |  |  |  | $1.20 |
Issued |  |  | 464,122 |  |  |  | C$0.85 |
Expired |  |  | (3,602,215 | ) |  |  | $1.99 |
Warrants outstanding and exercisable, December 31, 2019 |  |  | 7,639,968 |  |  |  | $0.79 |
Exercised |  |  | (4,195,072 | ) |  |  | $0.80 |
Exercised |  |  | (464,122 | ) |  |  | C$0.85 |
Warrants outstanding and exercisable, December 31, 2020 |  |  | 2,980,774 |  |  |  | $0.80 |
|  |  |  |  | All Warrants Outstanding and Exercisable |
Expiry Date |  | Exercise Price per Share |  |  | December 31, 2020 |  |  | December 31, 2019 |
July 30, 2020 |  | C$ | 0.85 |  |  |  | - |  |  |  | 464,122 |
September 25, 2023 |  | $ | 0.80 |  |  |  | 2,980,774 |  |  |  | 7,175,846 |
|  |  |  |  |  |  | 2,980,774 |  |  |  | 7,639,968 |
As at December 31, 2020, the weighted average remaining contractual life of warrants outstanding was 2.73 years (December 31, 2019 - 3.55 years). Valuation of the warrant liability requires the use of highly subjective estimates and assumptions including the expected stock price volatility. The expected volatility used in valuing warrants is based on volatility observed in historical periods. Changes in the underlying assumptions can materially affect the fair value estimates. The fair value of the warrant liability was calculated using the Black-Scholes model with the following weighted average assumptions and resulting fair values:
|  | December 31, 2020 |  |  | December 31, 2019 |
Weighted average assumptions: |  |  |  |  |  |
Risk-free interest rate |  |  | 0.20 | % |  |  | 1.68 | %
Expected dividend yield |  |  | 0 | % |  |  | 0 | %
Expected warrant life (years) |  |  | 2.73 |  |  |  | 3.57 |
Expected stock price volatility |  |  | 73.93 | % |  |  | 61.61 | %
Weighted average fair value |  | $ | 0.77 |  |  | $ | 0.22 |

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- Definition The entire disclosure for warrant liability. + References No definition available. + Details
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Period Type: | duration