Note H - Changes in Allowance for Doubtful Accounts (Details) - USD ($)	9 Months Ended	12 Months Ended
	Dec. 27, 2015	Mar. 29, 2015
Beginning balance	$ 443,000	$ 433,000
Bad debt expense	23,000	23,000
Accounts written off	(10,000)	(13,000)
Ending balance	$ 456,000	$ 443,000