Retirement Plan (Narrative) (Details) - 401(k) profit sharing plan [Member] - USD ($) $ in Millions	12 Months Ended
	Jan. 31, 2021	Dec. 31, 2020	Feb. 02, 2020
Profit sharing contributions percent on eligible wages		0.00%
Total expenses under the retirement plan	$ 1.6		$ 1.5
Contribution on 3% of Participant Compensation [Member]
Quarterly employer matching contribution percent	100.00%
Contribution on 2% of Participant Compensation [Member]
Quarterly employer matching contribution percent	50.00%
Employer Matching Contribution 100% [Member]
Participant percentage contribution to the plan	3.00%
Employer Matching Contribution 50% [Member]
Participant percentage contribution to the plan	2.00%