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Stock-based compensation (Tables) | 12 Months Ended
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Dec. 31, 2021
Stock-based compensation |
Schedule of significant weighted average assumptions | ​
​ | ​ | ​ | ​ | ​ | ​
​ |  | 2021 |  | 2020 |
Risk free interest rate |  | 0.20 | % | 0.17 | %
Expected option life (years) |  | 1.2 |  | 1.1 | ​
Expected volatility |  | 31.92 | % | 51.19 | %
Expected dividend yield |  | 2.87 | % | 2.42 | %
Schedule of company's stock option activity | A summary of the Company’s stock option activity for the year ended December 31, 2021 is as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | Weighted | ​ | ​ | ​
​ | ​ | ​ | ​ | Weighted | ​ | Average | ​ | ​ | ​
​ | ​ | ​ | ​ | Average | ​ | Remaining | ​ | Aggregate
​ | ​ | ​ | ​ | Exercise | ​ | Contractual | ​ | Intrinsic
​ |  | Options |  | Price |  | Life (Years) |  | Value (1)
Outstanding at beginning of period |  | 10,030 | ​ | $ | 12.98 |  |  |  | ​ |
Granted |  | 12,032 | ​ |  | 9.33 |  |  |  | ​ |
Exercised |  | (2,106) | ​ |  | 8.10 |  |  |  | ​ |
Forfeited/expired |  | (9,466) | ​ |  | 9.44 |  |  |  | ​ |
Outstanding as of December 31, 2021 |  | 10,490 | ​ | $ | 12.98 |  | 2.30 | years | $ | —
Exercisable as of December 31, 2021 |  | — | ​ | $ | — |  | — | years | $ | —
(1) | The intrinsic value of a stock option represents the amount by which the fair value of the underlying stock, measured by reference to the closing price of the common shares of $10.64 on the Nasdaq Global Select Market on December 31, 2021, exceeds the exercise price of the option.
Schedule of weighted average fair value of options at the date of grant and the intrinsic value | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2021 |  | 2020
Options granted with an exercise price below market price on the date of grant: |  | ​ |  |  | ​ |
Employees — preferred stock | ​ | $ | 3.71 | ​ | $ | 2.70
Overall weighted average | ​ |  | 3.71 | ​ |  | 2.70
​ | ​ | ​ | ​ | ​ | ​ | ​
Options granted with an exercise price at market price on the date of grant: | ​ |  |  | ​ |  |
Management employees | ​ | $ | — | ​ | $ | —
Employees — common stock | ​ |  | 2.89 | ​ |  | 2.45
Overall weighted average | ​ |  | 2.89 | ​ |  | 2.45
​ | ​ | ​ | ​ | ​ | ​ | ​
Options granted with an exercise price above market price on the date of grant: | ​ |  |  | ​ |  |
Management employees | ​ | $ | — | ​ | $ | —
Employees — preferred stock | ​ |  | — | ​ |  | —
Overall weighted average | ​ |  | — | ​ |  | —
​ | ​ | ​ | ​ | ​ | ​ | ​
Total intrinsic value of options exercised | ​ | $ | 7,876 | ​ | $ | 3,891

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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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