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Segment Reporting: (Details) (USD $)
 3 Months Ended 6 Months Ended
Jun. 28, 2014
item
Jun. 29, 2013
Jun. 28, 2014
Jun. 29, 2013
Dec. 28, 2013
Segment Reporting:          
Number of reportable business segments 2        
Segment Reporting          
Total revenue $ 14,038,900 $ 14,023,500 $ 28,591,500 $ 27,171,900  
Total operating income 7,092,600 7,061,200 14,527,100 13,737,100  
Total depreciation 97,100 105,000 202,400 212,000  
Total identifiable assets 50,715,400   50,715,400   53,036,100
Operating Segments [Member] | Franchising [Member]
          
Segment Reporting          
Total revenue 10,881,300 9,893,300 21,058,300 19,633,900  
Total operating income 5,311,200 4,840,800 10,012,400 9,674,900  
Total depreciation 76,600 82,600 159,700 166,800  
Total identifiable assets 3,265,500   3,265,500   7,407,400
Operating Segments [Member] | Leasing [Member]
          
Segment Reporting          
Total revenue 3,157,600 4,130,200 7,533,200 7,538,000  
Total operating income 1,781,400 2,220,400 4,514,700 4,062,200  
Total depreciation 20,500 22,400 42,700 45,200  
Total identifiable assets 44,228,100   44,228,100   42,490,800
Corporate, Non-Segment [Member]
          
Segment Reporting          
Total identifiable assets $ 3,221,800   $ 3,221,800   $ 3,137,900