Consolidated Statements of Stockholders' Equity (Parentheticals) - USD ($)	3 Months Ended
	Nov. 02, 2019	Aug. 03, 2019	May 04, 2019	Nov. 03, 2018	Aug. 04, 2018	May 05, 2018
us-gaap_StatementOfStockholdersEquityAbstract
Tax Effect of Unrealized Gains (Losses) On Available-For-Sale Securities	$ (8,000)	$ 262,000	$ 126,000	$ (117,000)	$ 98,000	$ (122,000)
Stock Transactions, Parenthetical Disclosures [Abstract]
Dividends per share	$ 0.33	$ 0.33	$ 0.33	$ 0.33	$ 0.33	$ 0.33
Class A common stock shares sold through employee stock purchase plans	18,252	5,402	20,676	17,923	2,791	19,763
Exercised	0	0	0	0	8,051	0
Class A common stock shares issued through restricted stock grant plans	(18,327)	(9,170)	355,609	(2,810)	13,224	342,341
Retirement of treasury shares - retired shares	129,339	0	208,041	117,300	423,200	52,904