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Consolidated Statements of Stockholders' Equity (Parentheticals) - USD ($) | 3 Months Ended
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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

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