Note D - Income Per Share - Earnings Per Share Reconciliation (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 25, 2016	Dec. 27, 2015	Dec. 25, 2016	Dec. 27, 2015
Net income, basic calculation	$ 699	$ 432	$ 6,756	$ 5,589
Number of shares, basic calculation (in shares)	4,175,000	4,408,000	4,171,000	4,474,000
Net income per share, basic calculation (in dollars per share)	$ 0.17	$ 0.10	$ 1.62	$ 1.25
Number of shares, effect of dilutive employee stock options (in shares)	34,000	36,000	31,000	30,000
Net income per share, effect of dilutive employee stock options (in dollars per share)			$ (0.01)	$ (0.01)
Net income, diluted calculation	$ 699	$ 432	$ 6,756	$ 5,589
Number of shares, diluted calculation (in shares)	4,209,000	4,444,000	4,202,000	4,504,000
Net income, diluted calculation (in dollars per share)	$ 0.17	$ 0.10	$ 1.61	$ 1.24