Changes in Accumulated Other Comprehensive Income (Details) - USD ($)	3 Months Ended						9 Months Ended
	Nov. 02, 2019	Aug. 03, 2019	May 04, 2019	Nov. 03, 2018	Aug. 04, 2018	May 05, 2018	Nov. 02, 2019	Nov. 03, 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	$ (25,000)	$ 859,000	412,000	$ (373,000)	$ 314,000	$ (392,000)	1,246,000	$ (451,000)
Ending Balance Accumulated other comprehensive income, net of tax	1,169,000						1,169,000
ChangeInUnrealizedGainsOnAvailableForSaleSecuritiesMember [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance Accumulated other comprehensive income, net of tax	1,194,000		$ (77,000)	(399,000)		$ (321,000)	(77,000)	(321,000)
Other Comprehensive Income Loss Before Reclassifications Net Of Tax	(165,000)			(373,000)			1,067,000	(504,000)
Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax	140,000			0			179,000	53,000
Unrealized gain on available-for-sale securities, net of deferred income taxes	(25,000)			(373,000)			1,246,000	(451,000)
Ending Balance Accumulated other comprehensive income, net of tax	$ 1,169,000	$ 1,194,000		$ (772,000)	$ (399,000)		$ 1,169,000	$ (772,000)