Note 3 - Leases (Details Textual) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jan. 25, 2025	Jan. 27, 2024	Jan. 25, 2025	Jan. 27, 2024	Apr. 27, 2024
Operating Lease, Cost	$ 4.2	$ 4.1	$ 12.5	$ 11.8
Operating Lease, Weighted Average Remaining Lease Term (Year)	4 years 10 months 6 days		4 years 10 months 6 days		4 years 9 months 18 days
Operating Lease, Weighted Average Discount Rate, Percent	4.50%		4.50%		4.30%
Operating Lease, Payments	$ 3.9	$ 3.5	$ 12.3	$ 11.4