Note 6 - Leases (Details Textual) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Oct. 28, 2023	Oct. 29, 2022	Oct. 28, 2023	Oct. 29, 2022	Apr. 29, 2023
Operating Lease, Cost	$ 4.0	$ 3.7	$ 7.7	$ 7.1
Operating Lease, Weighted Average Remaining Lease Term (Year)	4 years 1 month 28 days		4 years 1 month 28 days		4 years 4 months 2 days
Operating Lease, Weighted Average Discount Rate, Percent	3.74%		3.74%		3.30%
Operating Lease, Payments	$ 4.1	$ 3.7	$ 7.8	$ 7.1