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Note 10 - Earnings Per Share - Computation of Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Apr. 01, 2017
Net income	$ 36,029	$ 38,891
Basic (in shares)	24,339	22,748
Effect of dilutive securities (in shares)	436	241
Diluted (in shares)	24,775	22,989
Basic earnings per share (in dollars per share)	$ 1.48	$ 1.71
Diluted earnings per share (in dollars per share)	$ 1.45	$ 1.69

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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