Note D - Income Per Share - Earnings Per Share Reconciliation (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 23, 2018	Dec. 24, 2017	Dec. 23, 2018	Dec. 24, 2017
Net income, basic calculation	$ 9,722	$ (3,779)	$ 19,001	$ 2,263
Number of shares, basic calculation (in shares)	4,187,000	4,185,000	4,187,000	4,180,000
Net income per share, basic calculation (in dollars per share)	$ 2.32	$ (0.90)	$ 4.54	$ 0.54
Effect of dilutive employee stock options (in shares)	34,000		39,000	39,000
Effect of dilutive employee stock option (in dollars per share)	$ (0.02)		$ (0.04)
Net income, diluted calculation	$ 9,722	$ (3,779)	$ 19,001	$ 2,263
Number of shares, diluted calculation (in shares)	4,221,000	4,185,000	4,226,000	4,219,000
Net income per share, diluted calculation (in dollars per share)	$ 2.30	$ (0.90)	$ 4.50	$ 0.54