Note 8 - Income Taxes - Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands	12 Months Ended
	May 01, 2021	May 02, 2020	Apr. 27, 2019
Beginning balance	$ 1,974	$ 1,868	$ 1,733
Increases due to current period tax positions	150	120	139
Decreases due to lapse of statute of limitations and audit resolutions	(69)	(14)	(4)
Ending balance	$ 2,055	$ 1,974	$ 1,868