Shareholders' Equity (Deficit): (Tables)

12 Months Ended

Dec. 28, 2019

Shareholders' Equity (Deficit):

Schedule of stock option activity

				Weighted Average
				Remaining
	Number of	Weighted Average		Contractual Life
	Shares	Exercise Price		(years)	Intrinsic Value
Outstanding, December 31, 2016	673,670	$	62.11	6.11	$	43,139,100
Granted	69,500		128.00
Exercised	(80,236)		33.41
Forfeited	(4,750)		95.28
Outstanding, December 30, 2017	658,184		72.33	5.87		37,723,800
Granted	69,000		149.51
Exercised	(79,241)		39.37
Forfeited	(8,563)		119.24
Outstanding, December 29, 2018	639,380		84.12	5.61		47,808,100
Granted	54,800		170.14
Exercised	(190,172)		57.41
Forfeited	(24,450)		138.13
Outstanding, December 28, 2019	479,558	$	101.78	5.79	$	45,283,200
Exercisable, December 28, 2019	344,108	$	83.08	4.69	$	38,930,300

Schedule of weighted average assumptions used in estimation of fair value of options granted

	Year Ended
	December 28, 2019			December 29, 2018			December 30, 2017
Risk free interest rate		1.85	%		2.73	%		2.05	%
Expected life (years)		6			6			6
Expected volatility		19.30	%		19.94	%		25.64	%
Dividend yield		1.38	%		1.13	%		1.10	%
Option fair value	$	30.96		$	32.45		$	32.07