Note 11 - Pension Plans - Contributions for All Multi-employer Pension Plans (Details) - USD ($) $ in Thousands	12 Months Ended
	Apr. 29, 2023	Apr. 30, 2022	May 01, 2021
Statement [Line Items]
Fund	$ 2,566	$ 2,460	$ 2,381
CSSS Fund [Member]
Statement [Line Items]
Fund	1,601	1,462	1,469
WCT Fund [Member]
Statement [Line Items]
Fund	768	817	746
Other Multi-employer Pension Funds [Member]
Statement [Line Items]
Fund	$ 197	$ 181	$ 166