Note B - Adoption of New Accounting Pronouncements - Impact of New Standard on Condensed Consolidated Financial Statements (Details) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Dec. 23, 2018	Dec. 24, 2017		Dec. 23, 2018		Dec. 24, 2017		Mar. 25, 2018
Deferred income taxes	$ 456			$ 456				$ 0
Total assets	91,169			91,169				80,091
Accrued expenses and other current liabilities	8,675			8,675				11,248
Deferred franchise fees	319			319				193
Total current liabilities	12,833			12,833				18,006
Deferred income taxes								302
Deferred franchise fees	3,300			3,300				238
Total liabilities	162,786			162,786				164,659
(Accumulated deficit)	(54,323)			(54,323)				(68,181)
Stockholders’ equity before treasury stock	6,686			6,686				(7,265)
Total stockholders’ (deficit)	(71,617)			(71,617)				(84,568)
Total liabilities and stockholders’ (deficit)	91,169			91,169				$ 80,091
Revenues	20,222	$ 22,021	[1]	79,720	[1]	$ 84,295	[1]
General and administrative expenses	3,031	3,034		10,354		10,064
Advertising fund expense (Note B)	591	0		1,858
Total costs and expenses	15,326	16,651		57,257		61,741
Income from operations	4,896	5,370		22,463		22,554
Income before provision for income taxes	13,349	(7,086)		26,331		2,884
Provision (benefit) for income taxes	3,627	(3,307)		7,330		621
Net income	9,722	(3,779)		19,001		2,263
Accounts payable, accrued expenses and other current liabilities				(5,196)		(779)
Deferred franchise fees				453		100
Net cash provided by operating activities				7,373		7,795
Net cash provided by investing activities				12,449		(488)
Net cash (used in) financing activities				(4,329)		3,066
Net increase in cash and cash equivalents				15,493		10,373
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	(150)			(150)
Deferred franchise fees	(378)			(378)
Total current liabilities	(528)			(528)
Deferred income taxes
Deferred franchise fees	(2,112)			(2,112)
Total liabilities	(2,640)			(2,640)
(Accumulated deficit)	1,909			1,909
Stockholders’ equity before treasury stock	1,909			1,909
Total stockholders’ (deficit)	1,909			1,909
Total liabilities and stockholders’ (deficit)	(731)			(731)
Revenues	(107)			(245)
General and administrative expenses	(12)			(110)
Advertising fund expense (Note B)
Total costs and expenses	(12)			(110)
Income from operations	(95)			(135)
Income before provision for income taxes	(95)			(135)
Provision (benefit) for income taxes	(26)			(40)
Net income	(69)			(95)
Accounts payable, accrued expenses and other current liabilities				(150)
Deferred franchise fees				245
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	275			275
Total assets	275			275
Accrued expenses and other current liabilities
Deferred franchise fees	376			376
Total current liabilities	376			376
Deferred income taxes	275			275
Deferred franchise fees	(376)			(376)
Total liabilities	275			275
(Accumulated deficit)
Stockholders’ equity before treasury stock
Total stockholders’ (deficit)
Total liabilities and stockholders’ (deficit)	275			275
Revenues	(591)			(1,858)
General and administrative expenses
Advertising fund expense (Note B)	(591)			(1,858)
Total costs and expenses	(591)			(1,858)
Income from operations
Income before provision for income taxes
Provision (benefit) 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	90,713			90,713
Accrued expenses and other current liabilities	8,525			8,525
Deferred franchise fees	317			317
Total current liabilities	12,681			12,681
Deferred income taxes	275			275
Deferred franchise fees	812			812
Total liabilities	160,421			160,421
(Accumulated deficit)	(52,414)			(52,414)
Stockholders’ equity before treasury stock	8,595			8,595
Total stockholders’ (deficit)	(69,708)			(69,708)
Total liabilities and stockholders’ (deficit)	90,713			90,713
Revenues	19,524			77,617
General and administrative expenses	3,019			10,244
Advertising fund expense (Note B)
Total costs and expenses	14,723			55,289
Income from operations	4,801			22,328
Income before provision for income taxes	13,254			26,196
Provision (benefit) for income taxes	3,601			7,290
Net income	9,653			18,906
Accounts payable, accrued expenses and other current liabilities				(5,346)
Deferred franchise fees				698
Net cash provided by operating activities				7,373
Net cash provided by investing activities				12,449
Net cash (used in) financing activities				(4,329)
Net increase in cash and cash equivalents				15,493
Franchise Fees and Royalties [Member]
Revenues	911	1,088	[1]	3,254	[1]	3,575	[1]
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	(107)			(245)
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	804			3,009
Advertising Fund Revenue [Member]
Revenues	591		[1]	1,858	[1]		[1]
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	(591)			(1,858)
Advertising Fund Revenue [Member] | Calculated under Revenue Guidance in Effect before Topic 606 [Member]
Revenues

[1] As disclosed in Note B, prior period amounts have not been adjusted under the modified retrospective method of adoption of ASC 606.