Note 6 - Stockholders' Equity (Tables)

6 Months Ended

Jun. 24, 2012

Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]

	Number of shares			Weighted average exercise price		Average remaining contractual Life (years)		Aggregate intrinsic value
Outstanding, December 25, 2011		182,629		$	34.06		4.0	$	6,242
Granted		27,691			94.42
Exercised		(14,927	)		19.92
Cancelled		(1,764	)		35.08
Outstanding, June 24, 2012		193,629		$	43.77		4.0	$	7,918
Exercisable, June 24, 2012		112,284			29.70		3.1		5,989

Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block]

	Number of shares			Weighted average grant date fair value
Outstanding, December 25, 2011		360,280		$	45.95
Granted		136,744			93.28
Vested		(4,865	)		86.33
Cancelled		(14,083	)		50.81
Outstanding, June 24, 2012		478,076		$	58.93