Note 1 - Significant Accounting Policies - Allowance for Doubtful Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	May 01, 2021	May 02, 2020	Apr. 27, 2019
Balance at beginning of year	$ 1,350	$ 516	$ 452
Net charge (credit) to expense	(138)	893	87
Net charge-off	(72)	(59)	(23)
Balance at end of year	$ 1,140	$ 1,350	$ 516