Note D - Income Per Share - Earnings Per Share Reconciliation (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Jun. 25, 2017	Jun. 26, 2016
Net income, basic calculation	$ 2,922	$ 3,550
Number of shares, basic calculation (in shares)	4,177,000	4,166,000
Net income per share, basic calculation (in dollars per share)	$ 0.70	$ 0.85
Effect of dilutive employee stock options (in shares)	38,000	25,000
Effect of dilutive employee stock option (in dollars per share)	$ (0.01)
Net income, diluted calculation	$ 2,922	$ 3,550
Number of shares, diluted calculation (in shares)	4,215,000	4,191,000
Net income per share, diluted calculation (in dollars per share)	$ 0.69	$ 0.85