Changes in Accumulated Other Comprehensive Income (Details) - USD ($)	3 Months Ended				6 Months Ended
	Jul. 31, 2021	May 01, 2021	Aug. 01, 2020	May 02, 2020	Jul. 31, 2021	Aug. 01, 2020
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance Accumulated other comprehensive income, net of tax		$ 1,155,000			$ 1,155,000
Unrealized gain on available-for-sale securities, net of deferred income taxes	$ 145,000	134,000	$ (484,000)	$ (298,000)	(279,000)	$ 186,000
Ending Balance Accumulated other comprehensive income, net of tax	876,000				876,000
ChangeInUnrealizedGainsOnAvailableForSaleSecuritiesMember [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance Accumulated other comprehensive income, net of tax	1,021,000	1,155,000	1,125,000	1,423,000	1,155,000	1,423,000
Other Comprehensive Income Loss Before Reclassifications Net Of Tax	(171,000)		420,000		(344,000)	(381,000)
Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax	26,000		64,000		65,000	567,000
Unrealized gain on available-for-sale securities, net of deferred income taxes	(145,000)		484,000		(279,000)	186,000
Ending Balance Accumulated other comprehensive income, net of tax	$ 876,000	$ 1,021,000	$ 1,609,000	$ 1,125,000	$ 876,000	$ 1,609,000