Note M - Share-based Compensation - Outstanding Stock Options (Details) - USD ($) $ / shares in Units, $ in Thousands			3 Months Ended	12 Months Ended
		Mar. 29, 2015	Jun. 24, 2018	Mar. 25, 2018	[1]
Options outstanding (in shares)	[1]		68,498
Options outstanding, weighted average exercise price (in dollars per share)			$ 33.438	$ 33.438
Options outstanding, weighted average remaining contractual life (Year)			1 year 43 days	1 year 131 days
Options outstanding, aggregate intrinsic value			$ 4,207	$ 2,648
Options granted (in shares)		50,000
Granted, weighted average exercise price (in dollars per share)		$ 53.89
Options exercised (in shares)
Exercised, weighted average exercise price (in dollars per share)
Options outstanding (in shares)			68,498	68,498
Options exercisable (in shares)			48,348
Options exercisable, weighted average exercise price (in dollars per share)			$ 33.438
Options exercisable, weighted average remaining contractual life (Year)			1 year 43 days
Options exercisable, aggregate intrinsic value			$ 2,969

[1] Represents outstanding options after giving effect to the replacement options issued in connection with the Company's 2015 and 2017 special dividends.