Note D - Income Per Share - Earnings Per Share Reconciliation (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Jun. 24, 2018	Jun. 25, 2017
Net income, basic calculation	$ 4,795	$ 2,922
Number of shares, basic calculation (in shares)	4,185	4,177
Net income per share, basic calculation (in dollars per share)	$ 1.15	$ 0.70
Effect of dilutive employee stock options (in shares)	41	38
Effect of dilutive employee stock option (in dollars per share)	$ (0.02)	$ (0.01)
Net income, diluted calculation	$ 4,795	$ 2,922
Number of shares, diluted calculation (in shares)	4,226	4,215
Net income per share, diluted calculation (in dollars per share)	$ 1.13	$ 0.69