Note 7 - Major Customers and Export Sales (Details Textual)	3 Months Ended	9 Months Ended
Jun. 29, 2019	Jun. 30, 2018	Jun. 29, 2019	Jun. 30, 2018
Number of Countries in Which Products are Sold	2		4	4
Customer Concentration Risk [Member] \| Revenue Benchmark [Member]
Number of Major Customers	2	1	2	1
Concentration Risk, Percentage	99.00%		88.00%
Customer Concentration Risk [Member] \| Revenue Benchmark [Member] \| One Customer [Member]
Concentration Risk, Percentage	77.00%	97.00%	66.00%	87.00%
Customer Concentration Risk [Member] \| Revenue Benchmark [Member] \| Two Customer [Member]
Concentration Risk, Percentage	22.00%		22.00%

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6404-108592

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