Revenue Recognition: Franchising - Performance Obligations (Details)	3 Months Ended
	Mar. 31, 2018 USD ($)
Revenue Recognition: Franchising
Revenue, remaining peformance obligation	$ 10,322,900
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2018-04-01
Revenue Recognition: Franchising
Revenue, remaining peformance obligation	$ 1,247,500
Future estimated revenue to be recognised related to performance obligations
Duration of expected recognition period for remaining performance obligation	9 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2018-12-30
Revenue Recognition: Franchising
Revenue, remaining peformance obligation	$ 1,634,700
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	$ 1,498,100
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	$ 1,359,300
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]: 2021-12-26
Revenue Recognition: Franchising
Revenue, remaining peformance obligation	$ 1,214,400
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]: 2023-01-01
Revenue Recognition: Franchising
Revenue, remaining peformance obligation	$ 3,368,900
Future estimated revenue to be recognised related to performance obligations
Duration of expected recognition period for remaining performance obligation