Note 6 - Leases (Details Textual) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jan. 29, 2022	Jan. 30, 2021	Jan. 29, 2022	Jan. 30, 2021	May 01, 2021
Operating Lease, Cost	$ 3.5	$ 3.5	$ 11.1	$ 10.8
Operating Lease, Weighted Average Remaining Lease Term (Year)	4 years 6 months		4 years 6 months		3 years 21 days
Operating Lease, Weighted Average Discount Rate, Percent	3.10%		3.10%		3.38%
Operating Lease, Payments	$ 3.7	$ 3.3	$ 11.3	$ 10.3