Capital Stock (Tables)

12 Months Ended

Dec. 30, 2017

Equity [Abstract]

Summary of Restricted Stock Activity

The following table summarizes our restricted stock activity for the three years ended December 30, 2017:

	Shares			Weighted Average Price
Balance at December 27, 2014		72,900		$	27.82
Granted		44,104		$	45.68
Vested		(38,580	)	$	25.24
Cancelled		(35,182	)	$	44.84
Balance at December 26, 2015		43,242		$	34.49
Granted		133,794		$	49.45
Vested		(29,002	)	$	29.74
Cancelled		(2,671	)	$	33.79
Balance at December 31, 2016		145,363		$	49.22
Granted		70,611		$	78.27
Vested		(56,953	)	$	56.03
Cancelled		(5,294	)	$	51.56
Balance at December 30, 2017		153,727		$	59.96

Schedule of Weighted Average Valuation Assumptions Used to Calculate Fair Value of Options Granted

The following table summarizes the weighted average valuation assumptions used to calculate the fair value of options granted:

	2017			2016
Expected dividend yield		0	%		0	%
Expected stock price volatility		27	%		26	%
Risk-free interest rate		1.5	%		0.9	%
Expected life of options	3.0 years			3.0 years

Summary of Stock Option Activity

The following table summarizes our stock option activity for the three years ended December 30, 2017:

	Shares			Option Price per Share	Weighted Average Price		Weighted Average Remaining Terms (years)		Aggregate Intrinsic Value
Balance at December 27, 2014		75,000		$5.05 – $19.37	$	7.28
Exercised		(35,000	)	$5.05 – $19.37	$	7.76
Balance at December 26, 2015		40,000		$5.67 – $7.74	$	6.86
Granted		61,084		$41.59 – $53.32	$	44.36
Balance at December 31, 2016		101,084		$5.67 – $53.32	$	29.52
Granted		58,024		$69.02 – $82.59	$	78.58
Exercised		(32,751	)	$6.90 – $41.59	$	7.69
Cancelled		(3,810	)	$41.59 – $78.64	$	56.72
Balance at December 30, 2017		122,547		$5.67 – $82.59	$	57.74		3.6	$	1,402,012
Options exercisable at December 30, 2017		22,520		$5.67 – $53.32	$	31.07		2.6	$	677,188

Summary of Information Concerning Currently Outstanding and Exercisable Options

The following table summarizes information concerning currently outstanding and exercisable options at December 30, 2017:

		Options Outstanding						Options Exercisable
Range of Exercise Price		Number Outstanding		Weighted Average Remaining Contractual Life (years)		Weighted Average Exercise Price		Number Exercisable		Weighted Average Exercise Price
	$5.67 - $24.66		8,000		1.4	$	6.71		8,000	$	6.71
	$26.67 - $41.60		43,679		3.1	$	41.59		10,920	$	41.59
	$41.61 - $69.01		14,400		3.5	$	53.32		3,600	$	53.32
	$69.02 - $77.99		1,630		5.1	$	69.02		—	$	—
	$77.80 - $82.59		54,838		4.2	$	78.86		—	$	—
Balance at December 30, 2017			122,547		3.6	$	57.74		22,520	$	31.07