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Segment Reporting: (Details)	3 Months Ended								12 Months Ended
	Dec. 26, 2015 USD ($)	Sep. 26, 2015 USD ($)	Jun. 27, 2015 USD ($)	Mar. 28, 2015 USD ($)	Dec. 27, 2014 USD ($)	Sep. 27, 2014 USD ($)	Jun. 28, 2014 USD ($)	Mar. 29, 2014 USD ($)	Dec. 26, 2015 USD ($) item	Dec. 27, 2014 USD ($)	Dec. 28, 2013 USD ($)
Segment Reporting
Number of reportable business segments | item									2
Total revenue	$ 16,947,500	$ 15,999,500	$ 15,476,700	$ 21,024,100	$ 16,182,800	$ 16,404,400	$ 14,038,900	$ 14,552,600	$ 69,447,800	$ 61,178,700	$ 55,731,200
Total operating income	9,690,600	$ 9,341,800	$ 8,084,200	$ 9,974,100	9,354,500	$ 9,177,700	$ 7,092,600	$ 7,434,500	37,090,700	33,059,300	29,780,000
Total depreciation									432,600	412,000	431,500
Total identifiable assets	47,406,300				54,727,800				47,406,300	54,727,800
Franchising | Canadian operations
Segment Reporting
Total revenue									2,900,000	2,900,000	2,700,000
Operating | Franchising
Segment Reporting
Total revenue									47,882,100	44,931,400	41,207,100
Total operating income									26,891,000	23,631,800	21,867,700
Total depreciation									341,600	325,100	339,600
Total identifiable assets	3,100,900				3,258,300				3,100,900	3,258,300
Operating | Leasing
Segment Reporting
Total revenue									21,565,700	16,247,300	14,524,100
Total operating income									10,199,700	9,427,500	7,912,300
Total depreciation									91,000	86,900	$ 91,900
Total identifiable assets	39,687,400				44,870,800				39,687,400	44,870,800
Unallocated
Segment Reporting
Total identifiable assets	$ 4,618,000				$ 6,598,700				$ 4,618,000	$ 6,598,700

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.18)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
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-Paragraph 12
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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