Revenue Recognition: Franchising - Performance Obligations (Details)	9 Months Ended
	Sep. 29, 2018 USD ($)
Revenue Recognition: Franchising
Revenue, remaining peformance obligation	$ 10,274,500
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2018-09-30
Revenue Recognition: Franchising
Revenue, remaining peformance obligation	$ 429,200
Future estimated revenue to be recognised related to performance obligations
Duration of expected recognition period for remaining performance obligation	3 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2018-12-30
Revenue Recognition: Franchising
Revenue, remaining peformance obligation	$ 1,711,800
Future estimated revenue to be recognised related to performance obligations
Duration of expected recognition period for remaining performance obligation	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-12-29
Revenue Recognition: Franchising
Revenue, remaining peformance obligation	$ 1,575,300
Future estimated revenue to be recognised related to performance obligations
Duration of expected recognition period for remaining performance obligation	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-12-27
Revenue Recognition: Franchising
Revenue, remaining peformance obligation	$ 1,436,500
Future estimated revenue to be recognised related to performance obligations
Duration of expected recognition period for remaining performance obligation	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-12-26
Revenue Recognition: Franchising
Revenue, remaining peformance obligation	$ 1,291,500
Future estimated revenue to be recognised related to performance obligations
Duration of expected recognition period for remaining performance obligation	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01
Revenue Recognition: Franchising
Revenue, remaining peformance obligation	$ 3,830,200
Future estimated revenue to be recognised related to performance obligations
Duration of expected recognition period for remaining performance obligation