Note 8 - Retirement Plans (Details Textual) - USD ($) $ in Thousands	6 Months Ended
Oct. 02, 2021	Sep. 26, 2020
Defined Contribution Plan, Employer Discretionary Contribution Amount	$ 0	$ 0

Amount of discretionary contributions made by an employer to a defined contribution plan.

No definition available.

Name:	us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration