Note E - Income Per Share - Earnings Per Share Reconciliation (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 29, 2019	Sep. 23, 2018	Sep. 29, 2019	Sep. 23, 2018
Net income, basic calculation	$ 3,658	$ 4,484	$ 9,027	$ 9,279
Number of shares, basic calculation (in shares)	4,227,000	4,188,000	4,216,000	4,187,000
Net income per share, basic calculation (in dollars per share)	$ 0.87	$ 1.07	$ 2.14	$ 2.22
Effect of dilutive employee stock options (in shares)		43,000		42,000
Effect of dilutive employee stock options (in dollars per share)		$ (0.01)		$ (0.03)
Net income, diluted calculation	$ 3,658	$ 4,484	$ 9,027	$ 9,279
Number of shares, diluted calculation (in shares)	4,227,000	4,231,000	4,216,000	4,229,000
Net income per share, diluted calculation (in dollars per share)	$ 0.87	$ 1.06	$ 2.14	$ 2.19