Changes in Accumulated Other Comprehensive Income (Details) - USD ($)	3 Months Ended				6 Months Ended
	Aug. 03, 2019	May 04, 2019	Aug. 04, 2018	May 05, 2018	Aug. 03, 2019	Aug. 04, 2018
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance Accumulated other comprehensive income, net of tax		$ (77,000)			$ (77,000)
Unrealized gain on available-for-sale securities, net of deferred income taxes	$ 859,000	412,000	$ 314,000	$ (392,000)	1,271,000	$ (78,000)
Ending Balance Accumulated other comprehensive income, net of tax	1,194,000				1,194,000
ChangeInUnrealizedGainsOnAvailableForSaleSecuritiesMember [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance Accumulated other comprehensive income, net of tax	335,000	(77,000)	(713,000)	(321,000)	(77,000)	(321,000)
Other Comprehensive Income Loss Before Reclassifications Net Of Tax	829,000		260,000		1,232,000	(131,000)
Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax	30,000		54,000		39,000	53,000
Unrealized gain on available-for-sale securities, net of deferred income taxes	859,000		314,000		1,271,000	(78,000)
Ending Balance Accumulated other comprehensive income, net of tax	$ 1,194,000	$ 335,000	$ (399,000)	$ (713,000)	$ 1,194,000	$ (399,000)