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Segment Reporting: (Details)
 3 Months Ended 6 Months Ended
Jun. 25, 2016
USD ($)
Jun. 27, 2015
USD ($)
Jun. 25, 2016
USD ($)
item
Jun. 27, 2015
USD ($)
Dec. 26, 2015
USD ($)
Segment Reporting          
Number of reportable business segments | item     2    
Total revenue $ 16,299,800 $ 15,476,700 $ 32,480,100 $ 36,500,800  
Total operating income 9,323,100 8,084,200 17,361,700 18,058,300  
Total depreciation 108,100 106,600 217,300 214,200  
Total identifiable assets 42,817,800   42,817,800   $ 47,406,300
Operating | Franchising          
Segment Reporting          
Total revenue 12,147,500 11,813,400 23,815,100 22,827,900  
Total operating income 6,865,100 6,214,700 12,774,800 11,851,500  
Total depreciation 83,700 84,600 168,500 169,900  
Total identifiable assets 2,920,000   2,920,000   3,100,900
Operating | Leasing          
Segment Reporting          
Total revenue 4,152,300 3,663,300 8,665,000 13,672,900  
Total operating income 2,458,000 1,869,500 4,586,900 6,206,800  
Total depreciation 24,400 $ 22,000 48,800 $ 44,300  
Total identifiable assets 37,956,200   37,956,200   39,687,400
Unallocated          
Segment Reporting          
Total identifiable assets $ 1,941,600   $ 1,941,600   $ 4,618,000