Note O - Quarterly Financial Information (Details) - USD ($)		3 Months Ended																12 Months Ended
		Mar. 27, 2016		Dec. 27, 2015		Sep. 27, 2015		Jun. 28, 2015		Mar. 29, 2015		Dec. 28, 2014		Sep. 28, 2014		Jun. 29, 2014		Mar. 27, 2016	Mar. 29, 2015	Mar. 30, 2014
Total revenues		$ 19,053,000		$ 20,564,000		$ 30,619,000		$ 30,654,000		$ 20,340,000		$ 22,315,000		$ 28,872,000		$ 27,585,000		$ 100,890,000	$ 99,112,000	$ 79,752,000
Gross profit (a)	[1]	3,254,000		3,681,000		6,313,000		4,785,000		2,019,000		2,594,000		4,716,000		4,240,000
Income from operations		4,486,000		4,435,000		8,426,000		7,616,000		2,967,000		3,765,000		6,447,000		6,779,000		24,963,000	19,958,000	10,921,000
Net income		$ 507,000		$ 432,000		$ 2,847,000		$ 2,310,000		$ 1,537,000		$ 2,241,000		$ 3,854,000		$ 4,071,000		$ 6,096,000	$ 11,703,000	$ 8,327,000
Basic calculation (in dollars per share)		$ 0.12	[2]	$ 0.10	[2]	$ 0.64	[2]	$ 0.50	[2]	$ 0.34	[2]	$ 0.50	[2]	$ 0.86	[2]	$ 0.91	[2]	$ 1.38	$ 2.61	$ 1.87
Diluted calculation (in dollars per share)		$ 0.12	[2]	$ 0.10	[2]	$ 0.64	[2]	$ 0.50	[2]	$ 0.34	[2]	$ 0.49	[2]	$ 0.84	[2]	$ 0.89	[2]	$ 1.37	$ 2.55	$ 1.81
Basic calculation (in shares)		4,297,000	[2]	4,408,000	[2]	4,432,000	[2]	4,584,000	[2]	4,521,000	[2]	4,482,000	[2]	4,472,000	[2]	4,471,000	[2]	4,430,000	4,486,000	4,450,000
Diluted (b) (in shares)		4,337,000	[2]	4,444,000	[2]	4,449,000	[2]	4,621,000	[2]	4,562,000	[2]	4,603,000	[2]	4,593,000	[2]	4,593,000	[2]	4,463,000	4,588,000	4,605,000

[1] Gross profit represents the difference between sales and cost of sales.

[2] 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.