Note 4 - Leases (Details Textual) - USD ($) $ in Millions	12 Months Ended
	May 02, 2020	Apr. 27, 2019	Apr. 28, 2018
Operating Lease, Cost	$ 15.1
Operating Lease, Weighted Average Remaining Lease Term (Year)	4 years 3 months 18 days
Operating Lease, Weighted Average Discount Rate, Percent	3.38%
Operating Lease, Payments	$ 12.1
Operating Leases, Rent Expense, Total		$ 18.2	$ 13.3