Changes in Accumulated Other Comprehensive Income (Details) - USD ($)	3 Months Ended
	May 04, 2019	May 05, 2018
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance Accumulated other comprehensive income, net of tax	$ (77,000)
Other Comprehensive Income Loss Before Reclassifications Net Of Tax	403,000	$ (392,000)
Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax	9,000	0
Unrealized gain on available-for-sale securities, net of deferred income taxes	412,000	(392,000)
Ending Balance Accumulated other comprehensive income, net of tax	$ 335,000
ChangeInUnrealizedGainsOnAvailableForSaleSecuritiesMember [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance Accumulated other comprehensive income, net of tax		(77,000)
Other Comprehensive Income Loss Before Reclassifications Net Of Tax		403,000
Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax		9,000
Unrealized gain on available-for-sale securities, net of deferred income taxes		412,000
Ending Balance Accumulated other comprehensive income, net of tax		$ 335,000