Note H - Accounts and Other Receivables, Net - Changes in Allowance for Doubtful Accounts (Details) - USD ($) $ in Thousands	9 Months Ended		12 Months Ended
	Dec. 27, 2020	Dec. 29, 2019	Mar. 29, 2020
Beginning balance	$ 237	$ 585	$ 585
Bad debt expense	70	$ 7	71
Write-offs and other	(11)		(419)
Ending balance	$ 296		$ 237