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Segment Reporting: (Details)	3 Months Ended								12 Months Ended
	Dec. 31, 2016 USD ($)	Sep. 24, 2016 USD ($)	Jun. 25, 2016 USD ($)	Mar. 26, 2016 USD ($)	Dec. 26, 2015 USD ($)	Sep. 26, 2015 USD ($)	Jun. 27, 2015 USD ($)	Mar. 28, 2015 USD ($)	Dec. 31, 2016 USD ($) item	Dec. 26, 2015 USD ($)	Dec. 27, 2014 USD ($)
Segment Reporting
Number of reportable business segments | item									2
Total revenue	$ 17,365,900	$ 16,734,300	$ 16,299,800	$ 16,180,300	$ 6,947,500	$ 15,999,500	$ 15,476,700	$ 21,024,100	$ 66,580,300	$ 69,447,800	$ 61,178,700
Total operating income	10,501,300	$ 10,438,000	$ 9,323,100	$ 8,038,600	9,690,600	$ 9,341,800	$ 8,084,200	$ 9,974,100	38,301,000	37,090,700	33,059,300
Total depreciation and amortization									420,500	432,600	412,000
Total identifiable assets	48,581,600				47,406,300				48,581,600	47,406,300
Franchising | Canadian operations
Segment Reporting
Total revenue									3,300,000	2,900,000	2,900,000
Operating | Franchising
Segment Reporting
Total revenue									49,296,700	47,882,100	44,931,400
Total operating income									28,650,400	26,891,000	23,631,800
Total depreciation and amortization									325,200	341,600	325,100
Total identifiable assets	3,141,300				3,100,900				3,141,300	3,100,900
Operating | Leasing
Segment Reporting
Total revenue									17,283,600	21,565,700	16,247,300
Total operating income									9,650,600	10,199,700	9,427,500
Total depreciation and amortization									95,300	91,000	$ 86,900
Total identifiable assets	42,735,600				39,687,400				42,735,600	39,687,400
Unallocated
Segment Reporting
Total identifiable assets	$ 2,704,700				$ 4,618,000				$ 2,704,700	$ 4,618,000

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Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
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-Section 45
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Topic 225
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