Note C - Earnings Per Share Reconciliation (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended																12 Months Ended
	Mar. 27, 2016	[1]	Dec. 27, 2015	[1]	Sep. 27, 2015	[1]	Jun. 28, 2015	[1]	Mar. 29, 2015	[1]	Dec. 28, 2014	[1]	Sep. 28, 2014	[1]	Jun. 29, 2014	[1]	Mar. 27, 2016	Mar. 29, 2015	Mar. 30, 2014
Basic calculation																	$ 6,096	$ 11,703	$ 8,327
Basic calculation (in shares)	4,297,000		4,408,000		4,432,000		4,584,000		4,521,000		4,482,000		4,472,000		4,471,000		4,430,000	4,486,000	4,450,000
Basic calculation (in dollars per share)	$ 0.12		$ 0.10		$ 0.64		$ 0.50		$ 0.34		$ 0.50		$ 0.86		$ 0.91		$ 1.38	$ 2.61	$ 1.87
Effect of dilutive employee stock options (in shares)																	33,000	102,000	155,000
Effect of dilutive employee stock options (in dollars per share)																	$ (0.01)	$ (0.06)	$ (0.06)
Diluted calculation																	$ 6,096	$ 11,703	$ 8,327
Diluted (in shares)	4,337,000		4,444,000		4,449,000		4,621,000		4,562,000		4,603,000		4,593,000		4,593,000		4,463,000	4,588,000	4,605,000
Diluted calculation (in dollars per share)	$ 0.12		$ 0.10		$ 0.64		$ 0.50		$ 0.34		$ 0.49		$ 0.84		$ 0.89		$ 1.37	$ 2.55	$ 1.81

[1] The sum of the quarters may not equal the full year per share amounts included in the accompanying consolidated statements of earnings due to the effect of the weighted average number of shares outstanding during the fiscal years as compared to the quarters.