Stock options outstanding (Details)	12 Months Ended
Dec. 31, 2023 $ / shares shares
Share-Based Payment Arrangement, Option, Exercise Price Range [Line Items]
Shares exercisable \| shares	63,440
Weighted average exercise price \| $ / shares	$ 39.99
Remaining life	3 years 6 months 1 day
Twenty Nine Point Ninety Six To Thirty Three Point Seventy [Member]
Share-Based Payment Arrangement, Option, Exercise Price Range [Line Items]
Shares exercisable \| shares	15,630
Weighted average exercise price \| $ / shares	$ 28.95
Remaining life	1 year 4 months 25 days
Thirty Three Point Seventy To Forty Two Point Thirteen [Member]
Share-Based Payment Arrangement, Option, Exercise Price Range [Line Items]
Shares exercisable \| shares	12,000
Weighted average exercise price \| $ / shares	$ 38.45
Remaining life	3 years
Forty Two Point Thirteen To Forty Five Point Ninety Seven [Member]
Share-Based Payment Arrangement, Option, Exercise Price Range [Line Items]
Shares exercisable \| shares	35,810
Weighted average exercise price \| $ / shares	$ 45.32
Remaining life	4 years 5 months 30 days

Number of options outstanding, including both vested and non-vested options.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(i)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480429/718-10-50-2

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(ii)
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-URI https://asc.fasb.org//1943274/2147480429/718-10-50-2

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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The number of shares reserved for issuance pertaining to the outstanding exercisable stock options as of the balance sheet date in the customized range of exercise prices for which the market and performance vesting condition has been satisfied.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding.

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