Note I - Common Stock and Earnings Per Share (Details Textual) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	1 Months Ended	3 Months Ended
	May 07, 2021	Apr. 03, 2021	Mar. 28, 2020
Stock Repurchased and Retired During Period, Shares (in shares)		721	785
Stock Repurchased and Retired During Period, Value		$ 69,454	$ 57,029
Stock Repurchase Program, Remaining Authorized Repurchase Amount		80,546
Payments for Repurchase of Common Stock		$ 67,610	$ 57,029
Subsequent Event [Member]
Stock Repurchased and Retired During Period, Shares (in shares)	190
Payments for Repurchase of Common Stock	$ 18,367
Stock Acquired, Average Cost Per Share (in dollars per share)	$ 96.67