Note B - Adoption of New Accounting Pronouncements (Details Textual) - USD ($)		3 Months Ended			6 Months Ended
		Sep. 23, 2018	Sep. 24, 2017	[4]	Sep. 23, 2018		Sep. 24, 2017	[4]	Mar. 26, 2018	Mar. 25, 2018
Cumulative Effect of New Accounting Principle in Period of Adoption										$ (2,004,000)
Contract with Customer, Asset, Net, Total	[1]	$ 480,000			$ 480,000
Contract with Customer, Liability, Excluding Cash Received	[2]	3,183,000			3,183,000
Contract with Customer, Liability, Total		3,603,000			3,603,000					3,139,000	[3]
Revenue from Contract with Customer, Excluding Assessed Tax, Total		29,330,000	$ 31,471,000		59,498,000	[4]	$ 62,274,000
Franchise [Member]
Revenue from Contract with Customer, Excluding Assessed Tax, Total		135,000	$ 97,000		242,000	[4]	$ 157,000
Accounting Standards Update 2014-09 [Member]
Contract with Customer, Liability, Total		2,735,000			2,735,000
Accounts and Other Receivables, Net [Member]
Contract with Customer, Asset, Net, Total		40,000			40,000
Long-term Contractual Accounts Receivable [Member]
Contract with Customer, Asset, Net, Total		440,000			440,000
Deferred Franchise Fees [Member]
Contract with Customer, Liability, Excluding Cash Received		364,000			364,000
Other Liabilities [Member]
Contract with Customer, Liability, Excluding Cash Received		$ 2,819,000			$ 2,819,000
AOCI Attributable to Parent [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption									$ (2,004,000)	$ (2,004,000)

[1] Receivables of $40 and $440 are included in Accounts and other receivables, net and Long term contractual accounts receivable, respectively.

[2] Deferred franchise fees of $364 and $2,819 are included in Deferred franchise fees - current and long term, respectively.

[3] Includes the cumulative effect of adopting ASC 606 of $2,735.

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