Note 6 - Leases (Details Textual) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Oct. 29, 2022	Oct. 30, 2021	Oct. 29, 2022	Oct. 30, 2021	Apr. 30, 2022
Operating Lease, Cost	$ 3.7	$ 3.6	$ 7.1	$ 7.3
Operating Lease, Weighted Average Remaining Lease Term (Year)	4 years 3 months 14 days		4 years 3 months 14 days		4 years
Operating Lease, Weighted Average Discount Rate, Percent	2.90%		2.90%		3.08%
Operating Lease, Payments	$ 3.7	$ 4.0	$ 7.1	$ 7.6