Note 3 - Income Per Share (Details) - Table of Earnings per Share Reconciliation (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended																12 Months Ended
	Mar. 30, 2014		Dec. 29, 2013		Sep. 29, 2013		Jun. 30, 2013		Mar. 31, 2013		Dec. 23, 2012		Sep. 23, 2012		Jun. 24, 2012		Mar. 30, 2014	Mar. 31, 2013	Mar. 25, 2012
Table of Earnings per Share Reconciliation [Abstract]
Basic calculation																	$ 8,327	$ 7,468	$ 6,158
Basic calculation	4,459,000	[1]	4,466,000	[1]	4,460,000	[1]	4,415,000	[1]	4,411,000	[1]	4,414,000	[1]	4,407,000	[1]	4,368,000	[1]	4,450,000	4,400,000	4,906,000
Basic calculation	$ 0.27	[1]	$ 0.25	[1]	$ 0.59	[1]	$ 0.76	[1]	$ 0.35	[1]	$ 0.24	[1]	$ 0.65	[1]	$ 0.46	[1]	$ 1.87	$ 1.70	$ 1.26
Effect of dilutive employee stock options																	155,000	188,000	143,000
Effect of dilutive employee stock options																	$ (0.06)	$ (0.07)	$ (0.04)
Diluted calculation																	$ 8,327	$ 7,468	$ 6,158
Diluted calculation	4,594,000	[1]	4,622,000	[1]	4,625,000	[1]	4,588,000	[1]	4,603,000	[1]	4,612,000	[1]	4,604,000	[1]	4,531,000	[1]	4,605,000	4,588,000	5,049,000
Diluted calculation	$ 0.27	[1]	$ 0.24	[1]	$ 0.57	[1]	$ 0.73	[1]	$ 0.34	[1]	$ 0.23	[1]	$ 0.62	[1]	$ 0.44	[1]	$ 1.81	$ 1.63	$ 1.22

[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.