Note 6 - Stockholders' Equity (Detail) - Stock Options Activity (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended	6 Months Ended
Dec. 25, 2011	Jun. 24, 2012
Outstanding, December 25, 2011	182,629
Outstanding, December 25, 2011 (in Dollars per share)	$ 34.06
Outstanding, December 25, 2011	4 years	3 years 36 days
Outstanding, December 25, 2011 (in Dollars)	$ 6,242
Granted		27,691
Granted (in Dollars per share)		$ 94.42
Exercised		(14,927)
Exercised (in Dollars per share)		$ 19.92
Cancelled		(1,764)
Cancelled (in Dollars per share)		$ 35.08
Outstanding, June 24, 2012		193,629
Outstanding, June 24, 2012 (in Dollars per share)		$ 43.77
Outstanding, June 24, 2012		4 years
Outstanding, June 24, 2012 (in Dollars)		7,918
Exercisable, June 24, 2012		112,284
Exercisable, June 24, 2012 (in Dollars per share)		$ 29.70
Exercisable, June 24, 2012	4 years	3 years 36 days
Exercisable, June 24, 2012 (in Dollars)		$ 5,989

Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired.

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Weighted average price of options that were either forfeited or expired.

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Gross number of share options (or share units) granted during the period.

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The number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding as of the balance sheet date, including vested options.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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