Note 8 - Earnings Per Share (Detail) - Computation of Basic and Diluted Earnings Per Share under the Two-class Method (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 29, 2012	Oct. 01, 2011	Sep. 29, 2012	Oct. 01, 2011
Net income as reported	$ 23,998	$ 24,939	$ 65,491	$ 71,786
Less: Distributed earnings available to participating securities	(9)	(6)	(21)	(11)
Less: Undistributed earnings available to participating securities	(19)	(68)	(102)	(257)
Numerator for basic earnings per share —
Undistributed and distributed earnings available to common shareholders	23,970	24,865	65,368	71,518
Add: Undistributed earnings allocated to participating securities	19	68	102	257
Less: Undistributed earnings reallocated to participating securities	(19)	(67)	(100)	(253)
Numerator for diluted earnings per share —
Undistributed and distributed earnings available to common shareholders	$ 23,970	$ 24,866	$ 65,370	$ 71,522
Denominator for basic earnings per share —
Weighted-average shares (in Shares)	21,923	22,000	21,770	22,023
Effect of dilutive securities:
Common stock equivalents (in Shares)	239	287	285	384
Denominator for diluted earnings per share —
Adjusted for weighted-average shares & assumed conversions (in Shares)	22,162	22,287	22,055	22,407
Basic earnings per share (in Dollars per share)	$ 1.09	$ 1.13	$ 3.00	$ 3.25
Diluted earnings per share (in Dollars per share)	$ 1.08	$ 1.12	$ 2.96	$ 3.19