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Stock-based compensation (Tables) | 12 Months Ended
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Dec. 31, 2023
Stock-based compensation |
Schedule of significant weighted average assumptions | ​
​ | ​ | ​ | ​ | ​ | ​
​ |  | 2023 |  | 2022 |
Risk free interest rate |  | 5.06 | % | 1.64 | %
Expected option life (years) |  | 1.0 |  | 1.2 | ​
Expected volatility |  | 42.42 | % | 47.15 | %
Expected dividend yield |  | 1.60 | % | 2.35 | %
Schedule of company's stock option activity | A summary of the Company’s stock option activity for the year ended December 31, 2023 is as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | Weighted | ​ | ​ | ​
​ | ​ | ​ | ​ | Weighted | ​ | Average | ​ | ​ | ​
​ | ​ | ​ | ​ | Average | ​ | Remaining | ​ | Aggregate
​ | ​ | ​ | ​ | Exercise | ​ | Contractual | ​ | Intrinsic
​ |  | Options |  | Price |  | Life (Years) |  | Value (1)
Outstanding at beginning of period |  | 11,740 | ​ | $ | 13.59 |  |  |  | ​ |
Granted |  | 16,319 | ​ |  | 13.62 |  |  |  | ​ |
Exercised |  | (8,231) | ​ |  | 12.12 |  |  |  | ​ |
Forfeited/expired |  | (7,653) | ​ |  | 11.28 |  |  |  | ​ |
Outstanding as of December 31, 2023 |  | 12,175 | ​ | $ | 16.08 |  | 2.29 | years | $ | 237,705
Exercisable as of December 31, 2023 |  | — | ​ | $ | — |  | — | 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 $35.60 on the Nasdaq Global Select Market on December 31, 2023, exceeds the exercise price of the option.
Schedule of weighted average fair value of options at the date of grant and the intrinsic value | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2023 |  | 2022
Options granted with an exercise price below market price on the date of grant: |  | ​ |  |  | ​ |
Employees — preferred stock | ​ | $ | 12.21 | ​ | $ | 5.58
Overall weighted average | ​ |  | 12.21 | ​ |  | 5.58
​ | ​ | ​ | ​ | ​ | ​ | ​
Options granted with an exercise price at market price on the date of grant: | ​ |  |  | ​ |  |
Management employees | ​ | $ | — | ​ | $ | —
Employees — common stock | ​ |  | 8.29 | ​ |  | 4.32
Overall weighted average | ​ |  | 8.29 | ​ |  | 4.32
​ | ​ | ​ | ​ | ​ | ​ | ​
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 | ​ | $ | 104,559 | ​ | $ | 17,158

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