Note E - Income Per Share - Earnings Per Share Reconciliation (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 29, 2019	Dec. 23, 2018	Dec. 29, 2019	Dec. 23, 2018
Net income, basic calculation	$ 1,213	$ 9,722	$ 10,240	$ 19,001
Number of shares, basic calculation (in shares)	4,225,000	4,187,000	4,219,000	4,187,000
Net income per share, basic calculation (in dollars per share)	$ 0.29	$ 2.32	$ 2.43	$ 4.54
Effect of dilutive employee stock options (in shares)		34,000		39,000
Effect of dilutive employee stock options (in dollars per share)		$ (0.02)		$ (0.04)
Net income, diluted calculation	$ 1,213	$ 9,722	$ 10,240	$ 19,001
Number of shares, diluted calculation (in shares)	4,225,000	4,221,000	4,219,000	4,226,000
Net income per share, diluted calculation (in dollars per share)	$ 0.29	$ 2.30	$ 2.43	$ 4.50