Changes in Accumulated Other Comprehensive Income (Details) - USD ($)	3 Months Ended						9 Months Ended
	Oct. 31, 2020	Aug. 01, 2020	May 02, 2020	Nov. 02, 2019	Aug. 03, 2019	May 04, 2019	Oct. 31, 2020	Nov. 02, 2019
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance Accumulated other comprehensive income, net of tax			$ 1,423,000				$ 1,423,000
Unrealized gain on available-for-sale securities, net of deferred income taxes	$ 282,000	$ 484,000	298,000	$ 25,000	$ 859,000	$ 412,000	(96,000)	$ 1,246,000
Ending Balance Accumulated other comprehensive income, net of tax	1,327,000						1,327,000
ChangeInUnrealizedGainsOnAvailableForSaleSecuritiesMember [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance Accumulated other comprehensive income, net of tax	1,609,000		$ 1,423,000	1,194,000		$ (77,000)	1,423,000	(77,000)
Other Comprehensive Income Loss Before Reclassifications Net Of Tax	(350,000)			(165,000)			(732,000)	1,067,000
Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax	68,000			140,000			636,000	179,000
Unrealized gain on available-for-sale securities, net of deferred income taxes	(282,000)			(25,000)			(96,000)	1,246,000
Ending Balance Accumulated other comprehensive income, net of tax	$ 1,327,000	$ 1,609,000		$ 1,169,000	$ 1,194,000		$ 1,327,000	$ 1,169,000