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Segment Reporting: (Details)
 3 Months Ended 6 Months Ended
Jun. 27, 2015
USD ($)
Jun. 28, 2014
USD ($)
Jun. 27, 2015
USD ($)
item
Jun. 28, 2014
USD ($)
Dec. 27, 2014
USD ($)
Segment Reporting          
Number of reportable business segments | item     2    
Total revenue $ 15,476,700 $ 14,038,900 $ 36,500,800 $ 28,591,500  
Total operating income 8,084,200 7,092,600 18,058,300 14,527,100  
Total depreciation 106,600 97,100 214,200 202,400  
Total identifiable assets 45,289,800   45,289,800   $ 54,727,800
Operating | Franchising          
Segment Reporting          
Total revenue 11,813,400 10,881,300 22,827,900 21,058,300  
Total operating income 6,214,700 5,311,200 11,851,500 10,012,400  
Total depreciation 84,600 76,600 169,900 159,700  
Total identifiable assets 2,836,700   2,836,700   3,258,300
Operating | Leasing          
Segment Reporting          
Total revenue 3,663,300 3,157,600 13,672,900 7,533,200  
Total operating income 1,869,500 1,781,400 6,206,800 4,514,700  
Total depreciation 22,000 $ 20,500 44,300 $ 42,700  
Total identifiable assets 39,457,500   39,457,500   44,870,800
Unallocated          
Segment Reporting          
Total identifiable assets $ 2,995,600   $ 2,995,600   $ 6,598,700