Note I - Common Stock and Earnings Per Share (Details Textual) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended	9 Months Ended
Sep. 26, 2020	Sep. 28, 2019	Sep. 26, 2020	Sep. 28, 2019
Stock Repurchased During Period, Shares (in shares)	0
Stock Repurchased and Retired During Period, Shares (in shares)		1,358	785	2,009
Payments for Repurchase of Common Stock		$ 92,377	$ 57,029	$ 150,000
Stock Repurchase Program, Remaining Authorized Repurchase Amount	$ 72,971		$ 72,971

Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration