Note 8 - Income Taxes - Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands	12 Months Ended
	Apr. 27, 2024	Apr. 29, 2023	Apr. 30, 2022
Beginning balance	$ 2,096	$ 2,079	$ 2,055
Increases due to current period tax positions	60	75	114
Decreases due to lapse of statute of limitations and audit resolutions	(26)	(58)	(90)
Ending balance	$ 2,130	$ 2,096	$ 2,079