Note 8 - Earnings Per Share (Details) - 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
	Mar. 29, 2014	Mar. 30, 2013
Computation of Basic and Diluted Earnings Per Share under the Two-class Method [Abstract]
Net income as reported	$ 25,389	$ 11,488
Less: Distributed earnings available to participating securities		(9)
Less: Undistributed earnings available to participating securities		(7)
Numerator for basic earnings per share —
Undistributed and distributed earnings available to common shareholders	25,389	11,472
Add: Undistributed earnings allocated to participating securities		7
Less: Undistributed earnings reallocated to participating securities		(6)
Numerator for diluted earnings per share —
Undistributed and distributed earnings available to common shareholders	$ 25,389	$ 11,473
Denominator for basic earnings per share —
Weighted-average shares (in Shares)	22,492	22,095
Effect of dilutive securities:
Common stock equivalents (in Shares)	225	271
Denominator for diluted earnings per share —
Adjusted for weighted-average shares & assumed conversions (in Shares)	22,717	22,366
Basic earnings per share (in Dollars per share)	$ 1.13	$ 0.52
Diluted earnings per share (in Dollars per share)	$ 1.12	$ 0.51