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Income taxes (Tables) | 12 Months Ended
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Dec. 31, 2023
Income taxes |
Schedule of provision for income taxes | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Years Ended December 31, |  | 2023 |  | 2022 |  | 2021
(in thousands) | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Current: |  | ​ |  |  | ​ |  |  | ​ |
Federal | ​ | $ | 10,319 | ​ | $ | 11,995 | ​ | $ | 453
State and local | ​ |  | 2,940 | ​ |  | 2,835 | ​ |  | 350
​ | ​ |  | 13,259 | ​ |  | 14,830 | ​ |  | 803
Deferred: | ​ |  | ​ | ​ |  | ​ | ​ |  |
Federal | ​ |  | 3,667 | ​ |  | (323) | ​ |  | 267
State and local | ​ |  | 647 | ​ |  | (1,126) | ​ |  | 70
​ | ​ |  | 4,314 | ​ |  | (1,449) | ​ |  | 337
Expense for income taxes | ​ | $ | 17,573 | ​ | $ | 13,381 | ​ | $ | 1,140
Schedule of reconciliation of the Company's actual tax rate to the U.S. Federal statutory rate | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Years ended December 31, |  | 2023 |  | 2022 |  | 2021 |
Income tax rates | ​ | ​ | ​ | ​ | ​ | ​ | ​
- Statutory U.S. federal rate |  | 21 | % | 21 | % | 21 | %
- State income taxes, net of federal benefit |  | 4 | % | 4 | % | 0 | %
- Excess tax benefits related to stock compensation |  | (1) | % | (1) | % | (4) | %
- 162m limitation | ​ | 1 | % | 1 | % | — | ​
- PPP Benefit | ​ | 0 | % | 0 | % | (2) | %
- Change in valuation allowance |  | 0 | % | (13) | % | (12) | %
- Other true-up | ​ | 0 | % | (1) | % | — | ​
Total |  | 25 | % | 11 | % | 3 | %
Schedule of net deferred income tax assets (liabilities) | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
December 31, |  | 2023 |  | 2022
(in thousands) | ​ | ​ | ​ | ​ | ​ | ​
Deferred tax assets (liabilities): | ​ | ​ | ​ | ​ | ​ | ​
- Reserve for doubtful accounts | ​ | $ | 497 | ​ | $ | 500
- Inventory reserve | ​ |  | 687 | ​ |  | 1,045
-Non qualified stock options | ​ |  | 529 | ​ |  | 383
- Deferred interest | ​ |  | — | ​ |  | 2,637
- Accrued expenses | ​ |  | 82 | ​ |  | 107
Total Deferred income tax assets | ​ | $ | 1,795 | ​ | $ | 4,672
​ | ​ | ​ | ​ | ​ | ​ | ​
Deferred tax liabilities: | ​ |  | ​ | ​ |  | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
- Depreciation and amortization | ​ | ​ | (6,353) | ​ | ​ | (4,916)
Total deferred tax liabilities | ​ | ​ | (6,353) | ​ | ​ | (4,916)
Net deferred tax liabilities | ​ | $ | (4,558) | ​ | $ | (244)

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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://fasb.org/us-gaap/role/ref/legacyRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Paragraph 9 -Section 50 -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://fasb.org/us-gaap/role/ref/legacyRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Paragraph 2 -Section 50 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-2 + Details
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- Definition Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Paragraph 12 -Section 50 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-12 + Details
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