Revenue Recognition: Franchising - Performance Obligations (Details)	6 Months Ended
	Jun. 30, 2018 USD ($)
Revenue Recognition: Franchising
Revenue, remaining peformance obligation	$ 10,341,700
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2018-07-01
Revenue Recognition: Franchising
Revenue, remaining peformance obligation	$ 838,800
Future estimated revenue to be recognised related to performance obligations
Duration of expected recognition period for remaining performance obligation	6 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2018-12-30
Revenue Recognition: Franchising
Revenue, remaining peformance obligation	$ 1,679,800
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	$ 1,543,200
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	$ 1,404,400
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	$ 1,259,500
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	$ 3,616,000
Future estimated revenue to be recognised related to performance obligations
Duration of expected recognition period for remaining performance obligation