Changes in Accumulated Other Comprehensive Income (Details) - USD ($)	3 Months Ended
	Apr. 30, 2022	May 01, 2021
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance Accumulated other comprehensive income, net of tax	$ (280,000)	$ 1,155,000
Other Comprehensive Income Loss Before Reclassifications Net Of Tax	(1,203,000)	(173,000)
Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax	(3,000)	39,000
Unrealized gain on available-for-sale securities, net of deferred income taxes	(1,206,000)	(134,000)
Ending Balance Accumulated other comprehensive income, net of tax	(1,486,000)	1,021,000
ChangeInUnrealizedGainsOnAvailableForSaleSecuritiesMember [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance Accumulated other comprehensive income, net of tax	(280,000)
Unrealized gain on available-for-sale securities, net of deferred income taxes	(1,206,000)	$ (134,000)
Ending Balance Accumulated other comprehensive income, net of tax	$ (1,486,000)