Note 11 - Significant Customers and Industry Segment Information - Export Sales by Geographic Area (Details) - USD ($) $ in Thousands	12 Months Ended
Mar. 28, 2020	Mar. 30, 2019
Revenue	$ 11,768	$ 11,148
Export Sales [Member]
Revenue	133	94
Export Sales [Member] \| Europe [Member]
Revenue	13	14
Export Sales [Member] \| Asia [Member]
Revenue	10	12
Export Sales [Member] \| Rest of World [Member]
Revenue	$ 110	$ 68

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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+ Details