Note P - Quarterly Financial Information (Unaudited) - Quarterly Financial Information (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended																12 Months Ended
		Mar. 31, 2019	[1]	Dec. 23, 2018		Sep. 23, 2018		Jun. 24, 2018		Mar. 25, 2018		Dec. 24, 2017		Sep. 24, 2017		Jun. 25, 2017		Mar. 31, 2019	Mar. 25, 2018	Mar. 26, 2017
Total revenues		$ 22,129		$ 20,222		$ 29,330		$ 30,168		$ 19,906		$ 22,021		$ 31,471		$ 30,803
Gross profit (b)	[2]	3,600		3,744		6,413		5,025		2,482		4,168		6,486		4,820
Income from operations		5,513		4,896		8,480		9,087		4,546		5,370		8,734		8,450		$ 27,976	$ 27,100	$ 26,280
Net income		$ 2,492		$ 9,722		$ 4,484		$ 4,795		$ 367		$ (3,779)		$ 3,120		$ 2,922		$ 21,493	$ 2,630	$ 7,485
Net income per share, basic calculation (in dollars per share)		$ 0.60	[3]	$ 2.32	[3]	$ 1.07	[3]	$ 1.15	[3]	$ 0.09	[3]	$ (0.90)	[3]	$ 0.75	[3]	$ 0.70	[3]	$ 5.13	$ 0.63	$ 1.79
Net income per share, diluted calculation (in dollars per share)		$ 0.59	[3]	$ 2.30	[3]	$ 1.06	[3]	$ 1.13	[3]	$ 0.09	[3]	$ (0.90)	[3]	$ 0.74	[3]	$ 0.69	[3]	$ 5.09	$ 0.62	$ 1.78
Number of shares, basic calculation (in shares)		4,187,000	[3]	4,187,000	[3]	4,188,000	[3]	4,185,000	[3]	4,185,000	[3]	4,185,000	[3]	4,179,000	[3]	4,177,000	[3]	4,187,000	4,181,000	4,172,000
Number of shares, diluted calculation (in shares)		4,202,000	[3]	4,221,000	[3]	4,231,000	[3]	4,226,000	[3]	4,228,000	[3]	4,185,000	[3]	4,212,000	[3]	4,215,000	[3]	4,220,000	4,221,000	4,206,000

[1] The fourth quarter fiscal 2019 was comprised of 14 weeks, as compared to all other quarters which were comprised of 13 weeks.

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

[3] 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.