Note D - Revenues - Revenues by Geographical Market (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Dec. 29, 2019	Dec. 23, 2018	Dec. 29, 2019	Dec. 23, 2018
Revenues	$ 21,376	$ 20,222	$ 81,620	$ 79,720
UNITED STATES
Revenues	20,308	19,546	77,930	77,022
Non-US [Member]
Revenues	$ 1,068	$ 676	$ 3,690	$ 2,698

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045

Name:	us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration