Recent Accounting Pronouncements: ASU 2014-09 (Details) - USD ($)	3 Months Ended
	Mar. 31, 2018	Apr. 01, 2017	Dec. 30, 2017
Consolidated Statement of Operations
Selling, general and administrative expenses	$ 6,694,400	$ 6,512,500
Provision for income taxes	(2,369,000)	(3,265,300)
Net Income	$ 6,960,400	$ 5,550,800
Earnings per share - basic (in dollars per share)	$ 1.81	$ 1.33
Earnings per share - diluted (in dollars per share)	$ 1.69	$ 1.25
ASSETS
Prepaid expenses	$ 653,300		$ 901,600
Other assets	398,200		350,400
LIABILITIES AND SHAREHOLDERS' EQUITY (DEFICIT)
Deferred revenue - Current	3,016,900		3,012,700
Deferred revenue - Long term	7,306,000		7,297,500
Deferred income taxes	320,500		320,500
Retained earnings (accumulated deficit)	(30,652,500)		(37,189,700)
Franchise fees
Consolidated Statement of Operations
Revenue	400,900	$ 368,600
Other
Consolidated Statement of Operations
Revenue	$ 405,400	380,400
As Previously Reported
Consolidated Statement of Operations
Selling, general and administrative expenses		6,503,400
Provision for income taxes		(3,221,700)
Net Income		$ 5,416,400
Earnings per share - basic (in dollars per share)		$ 1.30
Earnings per share - diluted (in dollars per share)		$ 1.22
ASSETS
Prepaid expenses			814,800
LIABILITIES AND SHAREHOLDERS' EQUITY (DEFICIT)
Deferred revenue - Current			1,736,200
Deferred revenue - Long term			1,465,500
Deferred income taxes			1,956,500
Retained earnings (accumulated deficit)			(32,154,400)
As Previously Reported | Franchise fees
Consolidated Statement of Operations
Revenue		$ 269,300
As Previously Reported | Other
Consolidated Statement of Operations
Revenue		292,600
Adjustments
Consolidated Statement of Operations
Selling, general and administrative expenses		9,100
Provision for income taxes		(43,600)
Net Income		$ 134,400
Earnings per share - basic (in dollars per share)		$ 0.03
Earnings per share - diluted (in dollars per share)		$ 0.03
ASSETS
Prepaid expenses			86,800
Other assets			350,400
LIABILITIES AND SHAREHOLDERS' EQUITY (DEFICIT)
Deferred revenue - Current			1,276,500
Deferred revenue - Long term			5,832,000
Deferred income taxes			(1,636,000)
Retained earnings (accumulated deficit)			$ (5,035,300)
Adjustments | Franchise fees
Consolidated Statement of Operations
Revenue		$ 99,300
Adjustments | Other
Consolidated Statement of Operations
Revenue		$ 87,800