Changes in Accumulated Other Comprehensive Income (Details) - USD ($)	3 Months Ended				6 Months Ended
	Aug. 01, 2020	May 02, 2020	Aug. 03, 2019	May 04, 2019	Aug. 01, 2020	Aug. 03, 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	$ 484,000	(298,000)	$ 859,000	$ 412,000	186,000	$ 1,271,000
Ending Balance Accumulated other comprehensive income, net of tax	1,609,000				1,609,000
ChangeInUnrealizedGainsOnAvailableForSaleSecuritiesMember [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance Accumulated other comprehensive income, net of tax	1,125,000	1,423,000	335,000	(77,000)	1,423,000	(77,000)
Other Comprehensive Income Loss Before Reclassifications Net Of Tax	420,000		829,000		(381,000)	1,232,000
Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax	64,000		30,000		567,000	39,000
Unrealized gain on available-for-sale securities, net of deferred income taxes	484,000		859,000		186,000	1,271,000
Ending Balance Accumulated other comprehensive income, net of tax	$ 1,609,000	$ 1,125,000	$ 1,194,000	$ 335,000	$ 1,609,000	$ 1,194,000