Note 6 - Leases (Details Textual) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jan. 27, 2024	Jan. 28, 2023	Jan. 27, 2024	Jan. 28, 2023	Apr. 29, 2023
Operating Lease, Cost	$ 4.1	$ 3.6	$ 11.8	$ 10.7
Operating Lease, Weighted Average Remaining Lease Term (Year)	4 years 11 months 12 days		4 years 11 months 12 days		4 years 4 months 2 days
Operating Lease, Weighted Average Discount Rate, Percent	4.28%		4.28%		3.30%
Operating Lease, Payments	$ 3.5	$ 3.7	$ 11.4	$ 10.8