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Shareholders Equity (Tables) | 6 Months Ended
--- | ---
Jun. 30, 2021
Shareholders' Equity |
Schedule of purchases of equity Shares | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ |  | ​ | ​ | Maximum number
​ | ​ | ​ | ​ | ​ | ​ | of shares that
​ | ​ | ​ | ​ | ​ | ​ | may yet be
​ | ​ | Total number | ​ | Average price | ​ | purchased under
​ | ​ | of shares | ​ | paid per | ​ | the plans or
​ |  | purchased | ​ | share |  | programs
Beginning of normal-course issuer bid, January 1, 2021 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | 1,193,000
January 2021 (1) | ​ | — | ​ | $ | — | ​ | ​ | ​
February 2021 (1) | ​ | 62,400 | ​ | $ | 4.07 | ​ | ​ | ​
March 2021 (1) | ​ | 60,800 | ​ | $ | 3.92 | ​ | ​ | ​
April 2021 (1) | ​ | 63,315 | ​ | $ | 3.89 | ​ | ​ | ​
May 2021 (1) | ​ | 63,900 | ​ | $ | 4.02 | ​ | ​ | ​
June 2021 (1) | ​ | 13,800 | ​ | $ | 4.77 | ​ | ​ | ​
Total as of June 30, 2021 | ​ | 264,215 | ​ | $ | 4.02 | ​ | ​ | 928,785
| (1) | Epsilon repurchased these shares under its share repurchase program that commenced on January 1, 2021, as described above.
​
Schedule of restricted stock activity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Six months ended | ​ | Year ended
​ | ​ | June 30, 2021 | ​ | December 31, 2020
​ | ​ | ​ | ​ | Weighted | ​ | ​ | ​ | Weighted
​ | ​ | Number of | ​ | Average | ​ | Number of | ​ | Average
​ | ​ | Shares | ​ | Remaining Life | ​ | Shares | ​ | Remaining Life
​ |  | Outstanding |  | (years) |  | Outstanding |  | (years)
Balance non-vested Restricted Stock at beginning of period | ​ | 290,070 | ​ | 1.60 | ​ | 346,499 | ​ | 1.67
Granted | ​ | — | ​ | — | ​ | 111,900 | ​ | 3.00
Vested | ​ | — | ​ | — | ​ | (168,329) | ​ | —
Forfeited | ​ | (22,000) | ​ | 1.68 | ​ | — | ​ | —
Balance non-vested Restricted Stock at end of period | ​ | 268,070 | ​ | 1.09 | ​ | 290,070 | ​ | 1.60
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Schedule of assumptions used to calculate grant date fair value | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 30, | ​ | December 31,
​ |  | 2021 | ​ | 2020
Expected life (in years) | ​ | ​ | — | ​ | ​ | 0.33 - 3
Expected volatility | ​ | ​ | — | ​ | ​ | 42.1% - 53.6%
Risk-free rate of return | ​ | ​ | — | ​ | ​ | 0.10% - 0.17%
Weighted average grant-date fair value per PSU | ​ | $ | — | ​ | $ | 4.10
Schedule of PSU activity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Six months ended | ​ | Year ended
​ | ​ | June 30, 2021 | ​ | December 31, 2020
​ | ​ | ​ | ​ | Weighted | ​ | ​ | ​ | Weighted
​ | ​ | Number of | ​ | Average | ​ | Number of | ​ | Average
​ | ​ | Shares | ​ | Remaining Life | ​ | Shares | ​ | Remaining Life
​ |  | Outstanding |  | (years) |  | Outstanding |  | (years)
Balance non-vested PSUs at beginning of period | ​ | 193,167 | ​ | 1.60 | ​ | — | ​ | —
Granted | ​ | — | ​ | — | ​ | 214,000 | ​ | 1.61
Vested | ​ | (41,667) | ​ | — | ​ | (20,833) | ​ | —
Balance non-vested PSUs at end of period | ​ | 151,500 | ​ | 1.47 | ​ | 193,167 | ​ | 1.60
Summary of stock option activity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Six months ended | ​ | Year ended
​ | ​ | June 30, 2021 | ​ | December 31, 2020
​ | ​ | ​ | ​ | Weighted | ​ | ​ | ​ | Weighted
​ | ​ | Number of | ​ | Average | ​ | Number of | ​ | Average
​ | ​ | Options | ​ | Exercise | ​ | Options | ​ | Exercise
Exercise price in US$ |  | Outstanding |  | Price (1) |  | Outstanding |  | Price (1)
Balance at period-end | ​ | 245,000 | ​ | $ | 5.27 | ​ | ​ | 245,000 | ​ | $ | 5.27
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Exercisable at period-end | ​ | 245,000 | ​ | $ | 5.27 | ​ | ​ | 245,000 | ​ | $ | 5.27
| (1) | Exercise price has been converted to US$ using the rate of Cdn$1.33 to US$1, the rate on March 15, 2019, the date Epsilon Energy, Ltd was delisted from the TSX.

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