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Income Taxes: (Tables) | 12 Months Ended
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Dec. 31, 2022
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 31, 2022 |  | December 25, 2021 |  | December 26, 2020 |
Federal income tax expense at statutory rate (21%, 21%, 21%) | ​ | $ | 10,664,500 | ​ | $ | 10,472,100 | ​ | $ | 8,088,600 | ​
Change in valuation allowance | ​ |  | (6,600) | ​ |  | (1,914,400) | ​ |  | 54,000 | ​
State and local income taxes, net of federal benefit | ​ |  | 1,515,900 | ​ |  | 1,546,400 | ​ |  | 1,368,500 | ​
Permanent differences, including stock option expenses | ​ |  | (955,900) | ​ |  | (2,332,600) | ​ |  | (1,027,300) | ​
Expiration of attributes | ​ | ​ | — | ​ | ​ | 2,057,000 | ​ | ​ | — | ​
Adjustment to uncertain tax positions | ​ | ​ | 185,300 | ​ | ​ | 163,400 | ​ | ​ | 85,100 | ​
Other, net | ​ |  | (44,600) | ​ |  | (44,500) | ​ |  | 125,200 | ​
Actual income tax expense | ​ | $ | 11,358,600 | ​ | $ | 9,947,400 | ​ | $ | 8,694,100 | ​
​
Schedule of components of the provision for income taxes | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended |
​ |  | December 31, 2022 |  | December 25, 2021 |  | December 26, 2020 |
Current: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Federal | ​ | $ | 8,892,200 | ​ | $ | 8,782,000 | ​ | $ | 7,836,000 | ​
State | ​ |  | 2,167,900 | ​ |  | 2,193,900 | ​ |  | 1,795,800 | ​
Foreign | ​ |  | 586,200 | ​ |  | 333,500 | ​ |  | 286,000 | ​
Current provision | ​ |  | 11,646,300 | ​ |  | 11,309,400 | ​ |  | 9,917,800 | ​
Deferred: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Federal | ​ |  | (351,500) | ​ |  | (1,435,000) | ​ |  | (1,202,100) | ​
State | ​ |  | 63,800 | ​ |  | 73,000 | ​ |  | (21,600) | ​
Deferred provision | ​ |  | (287,700) | ​ |  | (1,362,000) | ​ |  | (1,223,700) | ​
Total provision for income taxes | ​ | $ | 11,358,600 | ​ | $ | 9,947,400 | ​ | $ | 8,694,100 | ​
​
Schedule of tax effects of temporary differences that give rise to the net deferred income tax assets and liabilities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | December 31, 2022 |  | December 25, 2021 |
Deferred tax assets: | ​ | ​ | ​ | ​ | ​ | ​ | ​
Accounts receivable and lease reserves | ​ | $ | 1,900 | ​ | $ | 15,500 | ​
Non-qualified stock option expense | ​ |  | 1,540,100 | ​ |  | 1,405,400 | ​
Deferred revenue | ​ |  | 1,584,600 | ​ |  | 1,663,500 | ​
Trademarks | ​ |  | 34,700 | ​ |  | 32,600 | ​
Lease deposits | ​ |  | 72,700 | ​ |  | 270,500 | ​
Impairment of note investments | ​ |  | 529,500 | ​ |  | 532,000 | ​
Lease revenue and initial direct costs | ​ | ​ | 63,400 | ​ | ​ | — | ​
Foreign tax credits | ​ | ​ | 372,100 | ​ | ​ | 376,200 | ​
Valuation allowance | ​ |  | (901,600) | ​ |  | (908,200) | ​
Other | ​ |  | 271,600 | ​ |  | 276,500 | ​
Total deferred tax assets | ​ |  | 3,569,000 | ​ |  | 3,664,000 | ​
Deferred tax liabilities: | ​ | ​ | ​ | ​ | ​ | ​ | ​
Lease revenue and initial direct costs | ​ |  | — | ​ |  | (362,200) | ​
Depreciation and amortization | ​ |  | (28,600) | ​ |  | (49,100) | ​
Total deferred tax liabilities | ​ |  | (28,600) | ​ |  | (411,300) | ​
Total net deferred tax assets | ​ | $ | 3,540,400 | ​ | $ | 3,252,700 | ​
​
Summary of activity related to the Company's unrecognized tax benefits | ​
​ | ​ | ​ | ​ | ​
​ |  | Total |
Balance at December 26, 2020 | ​ | $ | 510,100 | ​
Increases related to current year tax positions | ​ |  | 190,000 | ​
Expiration of the statute of limitations for the assessment of taxes | ​ |  | (22,900) | ​
Balance at December 25, 2021 | ​ | ​ | 677,200 | ​
Increases related to current year tax positions | ​ |  | 266,800 | ​
Subtractions for tax positions of prior years | ​ |  | (72,700) | ​
Balance at December 31, 2022 | ​ | $ | 871,300 | ​
​

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