Note 1 - Significant Accounting Policies - Allowance for Doubtful Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Apr. 29, 2023	Apr. 30, 2022	May 01, 2021
Statement [Line Items]
Balance at beginning of year	$ 559	$ 1,140	$ 1,350
Net charge (credit) to expense	11	(581)	(138)
Net charge-off	(47)	0	(72)
Balance at end of year	$ 523	$ 559	$ 1,140