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Income Taxes: (Details) - USD ($)
 12 Months Ended
Dec. 31, 2016
Dec. 26, 2015
Dec. 27, 2014
Income Taxes:      
Federal statutory tax rate (as a percent) 35.00%    
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 (35%) $ 12,581,100 $ 12,328,700 $ 11,406,100
Change in valuation allowance 13,800 (4,400) (25,800)
State and local income taxes, net of federal benefit 1,021,600 956,000 897,800
Permanent differences, including stock option expenses 84,300 158,100 144,500
Other, net 27,600 (13,300) 99,700
Total provision for income taxes 13,728,400 13,425,100 12,522,300
Current provision for income taxes:      
Federal 12,016,000 13,486,500 10,567,100
State 1,598,700 1,654,800 1,456,400
Foreign 396,600 425,900 386,900
Current provision 14,011,300 15,567,200 12,410,400
Deferred provision for income taxes:      
Federal (274,600) (1,983,200) 134,200
State (8,300) (158,900) (22,300)
Deferred provision (282,900) (2,142,100) 111,900
Total provision for income taxes 13,728,400 13,425,100 12,522,300
Deferred tax assets:      
Accounts receivable and lease reserves 347,400 345,200  
Non-qualified stock option expense 2,370,700 1,926,400  
Deferred franchise and software license fees 817,500 810,900  
Trademarks 76,800 85,700  
Lease deposits 1,674,300 1,373,000  
Loss from and impairment of equity and note investments 4,065,200 4,051,400  
Valuation allowance (4,065,200) (4,051,400)  
Other 413,100 372,800  
Total deferred tax assets 5,699,800 4,914,000  
Deferred tax liabilities:      
Lease revenue and initial direct costs (8,802,800) (8,277,600)  
Depreciation and amortization (228,900) (251,200)  
Total deferred tax liabilities (9,031,700) (8,528,800)  
Total net deferred tax liabilities (3,331,900) (3,614,800)  
Excess tax benefits related to stock option exercises 599,400 26,300 91,100
Unrecognized tax benefits, including interest and penalties 502,000 489,200  
Interest and penalties accrued related to unrecognized tax benefit 22,500 19,300  
Activity related to the company's unrecognized tax benefits      
Balance at the beginning of the period 469,900 449,000  
Increases related to current year tax positions 128,500 114,700  
Subtractions for tax positions of prior years (5,300) (8,000)  
Expiration of the statute of limitations for the assessment of taxes (113,600) (85,800)  
Balance at the end of the period $ 479,500 $ 469,900 $ 449,000
Period over which various statutes of limitations are expected to expire 12 months