Note M - Stockholders' Equity, Stock Plans and Other Employee Benefit Plans - A Summary of the Status of the Company's Stock Options (Details) - $ / shares		12 Months Ended
		Mar. 25, 2018	Mar. 26, 2017	Mar. 27, 2016	Mar. 29, 2015
Options outstanding – beginning of year (in shares)			124,030	142,964
Options outstanding – beginning of year (in dollars per share)			$ 26.29	$ 24.36
Granted (in shares)					50,000
Granted (in dollars per share)					$ 53.89
Replacement options issued (A) (in shares)	[1]	68,498
Replacement options issued (A) (in dollars per share)	[1]	$ 33.44
Expired (in shares)				(3,787)
Expired (in dollars per share)				$ 11.72
Cancellation of outstanding options (A) (in shares)	[1]	(64,384)
Cancellation of outstanding options (A) (in dollars per share)	[1]	$ 35.58
Exercised (in shares)		(11,361)	(48,285)	(15,147)
Exercised (in dollars per share)		$ 35.58	$ 11.72	$ 11.72
Options outstanding - end of year (in shares)		68,498		124,030	142,964
Options outstanding - end of year (in dollars per share)		$ 33.438		$ 26.29	$ 24.36
Options exercisable (in shares)		48,348	37,873	67,221
Options exercisable, weighted average exercise price (in dollars per share)		$ 33.438	$ 35.58	$ 18.44
Options Outstanding After Replacement Stock Issuance [Member]
Options outstanding – beginning of year (in shares)		75,745
Options outstanding – beginning of year (in dollars per share)		$ 35.58
Options outstanding - end of year (in shares)			75,745
Options outstanding - end of year (in dollars per share)			$ 35.58
Options Outstanding Before Replacement Stock Issuance [Member]
Options outstanding – beginning of year (in shares)		75,745
Options outstanding – beginning of year (in dollars per share)		$ 35.58
Options outstanding - end of year (in shares)			75,745
Options outstanding - end of year (in dollars per share)			$ 35.58

[1] Represents the effects on outstanding options after giving to the replacement options issued in connection with the Company's special dividend to the shareholders of record on December 22, 2017.