Note B - Adoption of New Accounting Pronouncements - Impact of New Standard on Condensed Consolidated Financial Statements (Details) - USD ($) $ in Thousands		3 Months Ended									12 Months Ended
		Mar. 31, 2019		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	Mar. 27, 2016
Deferred income taxes		$ 343					$ 0				$ 343	$ 0
Total assets		94,306					80,091				94,306	80,091	$ 78,125
Accrued expenses and other current liabilities		9,384					11,248				9,384	11,248
Deferred franchise fees		318					193				318	193
Total current liabilities		14,924					18,006				14,924	18,006
Deferred income taxes							302					302
Deferred franchise fees		2,687					238				2,687	238
Total liabilities		164,450					164,659				164,450	164,659
(Accumulated deficit)		(52,879)					(68,181)				(52,879)	(68,181)
Stockholders’ equity before treasury stock		8,159					(7,265)				8,159	(7,265)
Total stockholders’ (deficit)		(70,144)					(84,568)				(70,144)	(84,568)	(66,491)	$ (72,336)
Total liabilities and stockholders’ (deficit)		94,306					80,091				94,306	80,091
Revenues											101,849	104,201	96,256
General and administrative expenses											13,851	13,491	13,659
Advertising fund expense (Note B)											2,506	0
Total costs and expenses											73,873	77,101	69,976
Income from operations		5,513	[1]	$ 4,896	$ 8,480	$ 9,087	4,546	$ 5,370	$ 8,734	$ 8,450	27,976	27,100	26,280
Income before provision for income taxes											29,410	4,112	11,804
Provision for income taxes											7,917	1,482	4,319
Net income		2,492	[1]	$ 9,722	$ 4,484	$ 4,795	$ 367	$ (3,779)	$ 3,120	$ 2,922	21,493	2,630	7,485
Accounts payable, accrued expenses and other current liabilities											(3,367)	7,091	(673)
Deferred franchise fees											(161)	95	(39)
Net cash provided by operating activities											11,156	18,862	10,412
Net cash provided by investing activities											12,328	(550)	(1,128)
Net cash (used in) financing activities											(5,377)	(17,888)	(2,597)
Net increase in cash and cash equivalents											18,107	424	6,687
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Accounting Standards Update 2014-09 [Member] | Franchise Fees Adjustments [Member]
Deferred income taxes		(731)									(731)
Total assets		(731)									(731)
Accrued expenses and other current liabilities		(190)									(190)
Deferred franchise fees		(378)									(378)
Total current liabilities		(568)									(568)
Deferred income taxes
Deferred franchise fees		(2,140)									(2,140)
Total liabilities		(2,708)									(2,708)
(Accumulated deficit)		1,977									1,977
Stockholders’ equity before treasury stock		1,977									1,977
Total stockholders’ (deficit)		1,977									1,977
Total liabilities and stockholders’ (deficit)		(731)									(731)
Revenues											(217)
General and administrative expenses											(162)
Advertising fund expense (Note B)
Total costs and expenses											(162)
Income from operations											(55)
Income before provision for income taxes											(55)
Provision for income taxes											(24)
Net income											(27)
Accounts payable, accrued expenses and other current liabilities											(190)
Deferred franchise fees											217
Net cash provided by operating activities
Net cash provided by investing activities
Net cash (used in) financing activities
Net increase in cash and cash equivalents
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Accounting Standards Update 2014-09 [Member] | Balance Sheet Reclassification Adjustments [Member]
Deferred income taxes		388									388
Total assets		388									388
Accrued expenses and other current liabilities
Deferred franchise fees		369									369
Total current liabilities		369									369
Deferred income taxes		388									388
Deferred franchise fees		(369)									(369)
Total liabilities		388									388
(Accumulated deficit)
Stockholders’ equity before treasury stock
Total stockholders’ (deficit)
Total liabilities and stockholders’ (deficit)		388									388
Revenues											(2,502)
General and administrative expenses
Advertising fund expense (Note B)											(2,506)
Total costs and expenses											(2,506)
Income from operations											4
Income before provision for income taxes											4
Provision for income taxes
Net income
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Accounting Standards Update 2014-09 [Member] | Advertising Fund Adjustments [Member]
Net income
Accounts payable, accrued expenses and other current liabilities
Deferred franchise fees
Net cash provided by operating activities
Net cash provided by investing activities
Net cash (used in) financing activities
Net increase in cash and cash equivalents
Calculated under Revenue Guidance in Effect before Topic 606 [Member]
Deferred income taxes
Total assets		93,963									93,963
Accrued expenses and other current liabilities		9,194									9,194
Deferred franchise fees		309									309
Total current liabilities		14,725									14,725
Deferred income taxes		388									388
Deferred franchise fees		178									178
Total liabilities		162,130									162,130
(Accumulated deficit)		(50,902)									(50,902)
Stockholders’ equity before treasury stock		10,136									10,136
Total stockholders’ (deficit)		(68,167)									(68,167)
Total liabilities and stockholders’ (deficit)		$ 93,963									93,963
Revenues											99,130
General and administrative expenses											13,689
Advertising fund expense (Note B)
Total costs and expenses											71,205
Income from operations											27,925
Income before provision for income taxes											29,359
Provision for income taxes											7,893
Net income											21,466
Accounts payable, accrued expenses and other current liabilities											(3,557)
Deferred franchise fees											56
Net cash provided by operating activities											11,156
Net cash provided by investing activities											12,328
Net cash (used in) financing activities											(5,377)
Net increase in cash and cash equivalents											18,107
Franchise Fees and Royalties [Member]
Revenues											4,171	4,473	5,068
Franchise Fees and Royalties [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Accounting Standards Update 2014-09 [Member] | Franchise Fees Adjustments [Member]
Revenues											(217)
Franchise Fees and Royalties [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Accounting Standards Update 2014-09 [Member] | Balance Sheet Reclassification Adjustments [Member]
Revenues
Franchise Fees and Royalties [Member] | Calculated under Revenue Guidance in Effect before Topic 606 [Member]
Revenues											3,954
Advertising Fund Revenue [Member]
Revenues	[2]										2,502
Advertising Fund Revenue [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Accounting Standards Update 2014-09 [Member] | Franchise Fees Adjustments [Member]
Revenues
Advertising Fund Revenue [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Accounting Standards Update 2014-09 [Member] | Balance Sheet Reclassification Adjustments [Member]
Revenues											(2,502)
Advertising Fund Revenue [Member] | Calculated under Revenue Guidance in Effect before Topic 606 [Member]
Revenues

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

[2] Prior to adoption of Topic 606, inflows into the National Advertising Fund were not considered revenue.