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Income taxes | 12 Months Ended
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Dec. 31, 2023
Income Tax Disclosure [Abstract] |
Income taxes | Note 8 – Income taxes: The provision for income taxes and the difference between such provision for income taxes and the amount that would be expected using the U.S. federal statutory income tax rate of 21% are presented below. All of our pre-tax income relates to operations in the United States. ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Years ended December 31,
​ | ​ | 2021 |  | 2022 |  | 2023
​ | ​ | (In thousands)
Income tax expense: | ​ | ​ |  |  | ​ |  |  | ​ |
Currently payable | ​ | $ | 5,476 | ​ | $ | 7,130 | ​ | $ | 7,730
Deferred income tax benefit | ​ |  | (321) | ​ |  | (688) | ​ |  | (720)
Total | ​ | $ | 5,155 | ​ | $ | 6,442 | ​ | $ | 7,010
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Expected tax expense, at the U.S. federal statutory income tax rate of 21% | ​ | $ | 4,562 | ​ | $ | 5,736 | ​ | $ | 6,217
State income taxes | ​ |  | 692 | ​ |  | 827 | ​ |  | 786
Other, net | ​ |  | (99) | ​ |  | (121) | ​ |  | 7
Total income tax expense | ​ | $ | 5,155 | ​ | $ | 6,442 | ​ | $ | 7,010
​ Income taxes allocable to other comprehensive income (loss) related to marketable securities was nil in 2021 and insignificant in 2022 and 2023. The components of the net deferred tax liability are summarized below. ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31,
​ |  | 2022 |  | 2023
​ | ​ | (In thousands)
Tax effect of temporary differences related to: |  | ​ |  |  | ​ |
Inventories | ​ | $ | 369 | ​ | $ | 373
Property and equipment | ​ |  | (2,188) | ​ |  | (1,543)
Accrued liabilities and other deductible differences | ​ |  | 51 | ​ |  | 43
Accrued employee benefits | ​ |  | 1,262 | ​ |  | 1,343
Goodwill | ​ |  | (1,693) | ​ |  | (1,693)
Other taxable differences | ​ |  | (31) | ​ |  | (32)
Total deferred tax liability | ​ | $ | (2,230) | ​ | $ | (1,509)
​ We and Contran file income tax returns in U.S. federal and various state and local jurisdictions. Our income tax returns prior to 2020 are generally considered closed to examination by applicable tax authorities.

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- Definition The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480990/946-20-50-13 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(h)(2)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480678/235-10-S99-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//740/tableOfContent Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 14 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-14 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 21 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-21 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 270 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482526/740-270-50-1 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 17 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-17 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I.5.Q1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479360/740-10-S99-1 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 11.C) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479360/740-10-S99-2 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482603/740-30-50-2 + Details
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