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Income Taxes: (Tables) | 12 Months Ended
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Dec. 28, 2024
Income Taxes: |
Schedule of reconciliation of the expected federal income tax expense based on the federal statutory tax rate to the actual income tax expense | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended |
​ |  | December 28, 2024 |  | December 30, 2023 |  | December 31, 2022 |
Federal income tax expense at statutory rate (21%, 21%, 21%) | ​ | $ | 10,757,000 | ​ | $ | 10,785,900 | ​ | $ | 10,664,500 | ​
Change in valuation allowance | ​ |  | 180,000 | ​ |  | (551,600) | ​ |  | (6,600) | ​
State and local income taxes, net of federal benefit | ​ |  | 1,435,800 | ​ |  | 1,513,100 | ​ |  | 1,515,900 | ​
Permanent differences, including stock option expenses | ​ |  | (1,479,400) | ​ |  | (1,372,300) | ​ |  | (955,900) | ​
Expiration of attributes | ​ | ​ | — | ​ | ​ | 528,600 | ​ | ​ | — | ​
Adjustment to uncertain tax positions | ​ | ​ | 258,500 | ​ | ​ | 240,100 | ​ | ​ | 185,300 | ​
Other, net | ​ |  | 117,900 | ​ |  | 39,400 | ​ |  | (44,600) | ​
Actual income tax expense | ​ | $ | 11,269,800 | ​ | $ | 11,183,200 | ​ | $ | 11,358,600 | ​
Schedule of components of the provision for income taxes | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended |
​ |  | December 28, 2024 |  | December 30, 2023 |  | December 31, 2022 |
Current: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Federal | ​ | $ | 8,840,600 | ​ | $ | 9,237,600 | ​ | $ | 8,892,200 | ​
State | ​ |  | 2,025,500 | ​ |  | 1,883,900 | ​ |  | 2,167,900 | ​
Foreign | ​ |  | 563,000 | ​ |  | 573,800 | ​ |  | 586,200 | ​
Current provision | ​ |  | 11,429,100 | ​ |  | 11,695,300 | ​ |  | 11,646,300 | ​
Deferred: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Federal | ​ |  | (108,900) | ​ |  | (504,700) | ​ |  | (351,500) | ​
State | ​ |  | (50,400) | ​ |  | (7,400) | ​ |  | 63,800 | ​
Deferred provision | ​ |  | (159,300) | ​ |  | (512,100) | ​ |  | (287,700) | ​
Total provision for income taxes | ​ | $ | 11,269,800 | ​ | $ | 11,183,200 | ​ | $ | 11,358,600 | ​
Schedule of tax effects of temporary differences that give rise to the net deferred income tax assets and liabilities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | December 28, 2024 |  | December 30, 2023 |
Deferred tax assets: | ​ | ​ | ​ | ​ | ​ | ​ | ​
Accounts receivable and lease reserves | ​ | $ | 100 | ​ | $ | 500 | ​
Non-qualified stock option expense | ​ |  | 1,942,000 | ​ |  | 1,769,200 | ​
Deferred revenue | ​ |  | 1,728,100 | ​ |  | 1,612,200 | ​
Trademarks | ​ |  | 40,200 | ​ |  | 36,900 | ​
Lease deposits | ​ |  | — | ​ |  | 6,700 | ​
Lease revenue and initial direct costs | ​ | ​ | 21,300 | ​ | ​ | 29,200 | ​
Foreign tax credits | ​ | ​ | 597,300 | ​ | ​ | 631,100 | ​
Valuation allowance | ​ |  | (530,000) | ​ |  | (350,000) | ​
Operating lease liabilities | ​ | ​ | 884,500 | ​ | ​ | 1,026,600 | ​
Other | ​ |  | 348,300 | ​ |  | 291,100 | ​
Total deferred tax assets | ​ |  | 5,031,800 | ​ |  | 5,053,500 | ​
Deferred tax liabilities: | ​ | ​ | ​ | ​ | ​ | ​ | ​
Depreciation and amortization | ​ |  | (820,000) | ​ |  | (1,001,100) | ​
Total deferred tax liabilities | ​ |  | (820,000) | ​ |  | (1,001,100) | ​
Total net deferred tax assets | ​ | $ | 4,211,800 | ​ | $ | 4,052,400 | ​
Summary of activity related to the Company's unrecognized tax benefits | ​
​ | ​ | ​ | ​ | ​
​ |  | Total |
Balance at December 31, 2022 | ​ | $ | 871,300 | ​
Increases related to current year tax positions | ​ |  | 277,600 | ​
Expiration of the statute of limitations for the assessment of taxes | ​ |  | (65,800) | ​
Balance at December 30, 2023 | ​ | ​ | 1,083,100 | ​
Increases related to current year tax positions | ​ |  | 283,100 | ​
Expiration of the statute of limitations for the assessment of taxes | ​ |  | (71,900) | ​
Balance at December 28, 2024 | ​ | $ | 1,294,300 | ​

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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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