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Segment Reporting: (Details)
 3 Months Ended
Mar. 26, 2016
USD ($)
item
Mar. 28, 2015
USD ($)
Dec. 26, 2015
USD ($)
Segment Reporting      
Number of reportable business segments | item 2    
Total revenue $ 16,180,300 $ 21,024,100  
Total operating income 8,038,600 9,974,100  
Total depreciation 109,200 107,600  
Total identifiable assets 43,755,500 47,406,300 $ 47,406,300
Operating | Franchising      
Segment Reporting      
Total revenue 11,667,600 11,014,500  
Total operating income 5,909,700 5,636,800  
Total depreciation 84,800 85,300  
Total identifiable assets 3,034,600 3,100,900  
Operating | Leasing      
Segment Reporting      
Total revenue 4,512,700 10,009,600  
Total operating income 2,128,900 4,337,300  
Total depreciation 24,400 22,300  
Total identifiable assets 39,468,800 39,687,400  
Unallocated      
Segment Reporting      
Total identifiable assets $ 1,252,100 $ 4,618,000