Note D - Income Per Share - Earnings Per Share Reconciliation (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 24, 2023	Sep. 25, 2022	Sep. 24, 2023	Sep. 25, 2022
Net income, basic calculation	$ 5,711	$ 5,958	$ 13,099	$ 13,095
Basic calculation	$ 5,711	$ 5,958	$ 13,099	$ 13,095
Number of shares, basic calculation (in shares)	4,080	4,083	4,080	4,098
Basic calculation (in shares)	4,080	4,083	4,080	4,098
Net income per share, basic calculation (in dollars per share)	$ 1.40	$ 1.46	$ 3.21	$ 3.20
Basic calculation (in dollars per share)	$ 1.40	$ 1.46	$ 3.21	$ 3.20
Effect of dilutive share-based awards (in shares)	12	0	10	0
Effect of dilutive employee stock options (in shares)	12	0	10	0
Effect of dilutive share-based awards (in dollars per share)	$ 0	$ 0	$ (0.01)	$ 0
Net income, diluted calculation	$ 5,711	$ 5,958	$ 13,099	$ 13,095
Diluted calculation	$ 5,711	$ 5,958	$ 13,099	$ 13,095
Number of shares, diluted calculation (in shares)	4,092	4,083	4,090	4,098
Diluted calculation (in shares)	4,092	4,083	4,090	4,098
Net income per share, diluted calculation (in dollars per share)	$ 1.40	$ 1.46	$ 3.20	$ 3.20
Diluted calculation (in dollars per share)	$ 1.40	$ 1.46	$ 3.20	$ 3.20