Note H - Accounts and Other Receivables, Net - Changes in Allowance for Doubtful Accounts (Details) - USD ($) $ in Thousands	9 Months Ended		12 Months Ended
	Dec. 29, 2019	Dec. 23, 2018	Mar. 31, 2019
Beginning balance	$ 585	$ 468	$ 468
Reclassification to conform with Topic 606			77
Bad debt expense	7	$ 48	100
Accounts written off	(94)		(60)
Ending balance	$ 498		$ 585