Note M - Stockholders' Equity, Stock Plans and Other Employee Benefit Plans - Outstanding Stock Options (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Mar. 26, 2017	Mar. 29, 2015	Mar. 27, 2016	Mar. 30, 2014
Options exercisable - end of year (in dollars per share)	$ 35.58		$ 18.44
Options exercisable, weighted average remaining contractual life (Year)	2 years 131 days
Options exercisable, aggregate intrinsic value	$ 950
Options outstanding (in shares)	75,745	142,964		279,500
Options outstanding, weighted average exercise price (in dollars per share)	$ 35.58	$ 24.36		$ 15.22
Options outstanding, weighted average remaining contractual life (Year)	2 years 131 days	2 years 317 days
Options outstanding, aggregate intrinsic value	$ 1,899	$ 3,460
Options exercisable - end of year (in shares)	37,873		67,221