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Income taxes (Tables) | 12 Months Ended
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Dec. 31, 2024
Income taxes [Abstract] |
Schedule of Components of Pre-tax Income and Provision for Income Taxes | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Years ended December 31,
​ | ​ | 2022 |  | 2023 |  | 2024
​ | ​ | (In thousands)
Income tax expense: | ​ | ​ |  |  | ​ |  |  | ​ |
Currently payable | ​ | $ | 7,130 | ​ | $ | 7,730 | ​ | $ | 5,590
Deferred income tax benefit | ​ |  | (688) | ​ |  | (720) | ​ |  | (440)
Total | ​ | $ | 6,442 | ​ | $ | 7,010 | ​ | $ | 5,150
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Expected tax expense, at the U.S. federal statutory income tax rate of 21% | ​ | $ | 5,736 | ​ | $ | 6,217 | ​ | $ | 4,565
State income taxes | ​ |  | 827 | ​ |  | 786 | ​ |  | 571
Other, net | ​ |  | (121) | ​ |  | 7 | ​ |  | 14
Income tax expense | ​ | $ | 6,442 | ​ | $ | 7,010 | ​ | $ | 5,150
Schedule of Components of Net Deferred Tax Liability | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31,
​ |  | 2023 |  | 2024
​ | ​ | (In thousands)
Tax effect of temporary differences related to: |  | ​ |  |  | ​ |
Inventories | ​ | $ | 373 | ​ | $ | 394
Property and equipment | ​ |  | (1,543) | ​ |  | (1,005)
Accrued liabilities and other deductible differences | ​ |  | 43 | ​ |  | 47
Accrued employee benefits | ​ |  | 1,343 | ​ |  | 1,225
Goodwill | ​ |  | (1,693) | ​ |  | (1,693)
Other taxable differences | ​ |  | (32) | ​ |  | (35)
Net noncurrent deferred tax liability | ​ | $ | (1,509) | ​ | $ | (1,067)

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- Definition Tabular disclosure of the components of income tax expense attributable to continuing operations for each year presented including, but not limited to: current tax expense (benefit), deferred tax expense (benefit), investment tax credits, government grants, the benefits of operating loss carryforwards, tax expense that results from allocating certain tax benefits either directly to contributed capital or to reduce goodwill or other noncurrent intangible assets of an acquired entity, adjustments of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity, and adjustments of the beginning-of-the-year balances of a valuation allowance because of a change in circumstances that causes a change in judgment about the realizability of the related deferred tax asset in future years. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-9 + Details
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- Definition Tabular disclosure of the components of net deferred tax asset or liability recognized in an entity's statement of financial position, including the following: the total of all deferred tax liabilities, the total of all deferred tax assets, the total valuation allowance recognized for deferred tax assets. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-2 + Details
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