Note E - Income Per Share - Table of Earnings Per Share Reconciliation (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 27, 2015	Sep. 28, 2014	Sep. 27, 2015	Sep. 28, 2014
Basic EPS
Basic calculation	$ 2,847	$ 3,854	$ 5,157	$ 7,925
Basic calculation (in shares)	4,432,000	4,472,000	4,508,000	4,472,000
Basic calculation (in dollars per share)	$ 0.64	$ 0.86	$ 1.14	$ 1.77
Effect of dilutive employee stock options (in shares)	17,000	121,000	27,000	121,000
Effect of dilutive employee stock options (in dollars per share)		$ (0.02)		$ (0.04)
Diluted EPS
Diluted calculation	$ 2,847	$ 3,854	$ 5,157	$ 7,925
Diluted calculation (in shares)	4,449,000	4,593,000	4,535,000	4,593,000
Diluted calculation (in dollars per share)	$ 0.64	$ 0.84	$ 1.14	$ 1.73
Basic calculation	$ 2,847	$ 3,854	$ 5,157	$ 7,925
Basic calculation (in shares)	4,432,000	4,472,000	4,508,000	4,472,000
Basic calculation (in dollars per share)	$ 0.64	$ 0.86	$ 1.14	$ 1.77
Effect of dilutive employee stock options (in shares)	17,000	121,000	27,000	121,000
Effect of dilutive employee stock options (in dollars per share)		$ (0.02)		$ (0.04)