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Income Taxes: Reconciliation, Components and Deferred Taxes (Details) - USD ($)
 12 Months Ended
Dec. 28, 2024
Dec. 30, 2023
Dec. 31, 2022
Income Taxes:      
Federal statutory tax rate (as a percent) 21.00% 21.00% 21.00%
Reconciliation of the expected federal income tax expense based on the federal statutory tax rate to the actual income tax expense      
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)
Total provision for income taxes 11,269,800 11,183,200 11,358,600
Current provision for income taxes:      
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 provision for income taxes:      
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
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