Note K - Share-based Compensation - Outstanding Stock Options (Details) - USD ($) $ / shares in Units, $ in Thousands		9 Months Ended	12 Months Ended
		Dec. 25, 2016	Mar. 27, 2016	[1]
Options outstanding, beginning balance (in shares)	[1]	124,030
Options outstanding, weighted average exercise price, beginning balance (in dollars per share)	[1]	$ 26.29
Options outstanding, weighted average remaining contractual life, beginning balance (Year)		2 years 222 days	2 years 47 days
Options outstanding, aggregate intrinsic value, beginning balance		$ 2,164	$ 1,952
Options exercised (in shares)		(48,285)
Exercised, weighted average exercise price (in dollars per share)		$ 11.72
Options exercised, aggregate intrinsic value		$ 1,555
Options outstanding, ending balance (in shares)		75,745	124,030
Options outstanding, weighted average exercise price, ending balance (in dollars per share)		$ 35.58	$ 26.29
Options exercisable (in shares)		37,873
Options exercisable, weighted average exercise price (in dollars per share)		$ 35.58
Options exercisable, weighted average remaining contractual life (Year)		2 years 222 days
Options exercisable, aggregate intrinsic value		$ 1,082

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