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Note 13 - Fair Value of Financial Instruments - Estimate Fair Value of Financial Instruments (Details) | Sep. 27, 2020 $ / shares yr | Sep. 29, 2019 $ / shares yr | Sep. 30, 2018 $ / shares yr
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Measurement Input, Price Volatility [Member] |  |  |
Warrant and rights, measurement input | 0.84 | 0.48 | 0.31
Measurement Input, Risk Free Interest Rate [Member] |  |  |
Warrant and rights, measurement input | 0.0012 | 0.0158 | 0.0291
Measurement Input, Expected Term [Member] |  |  |
Warrant and rights, measurement input | yr | 1.5 | 2.5 | 3.5
Measurement Input, Share Price [Member] |  |  |
Warrant and rights, measurement input | $ / shares | 0.06 | 0.20 | 0.3

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- Definition Value of input used to measure outstanding warrant and right embodying unconditional obligation requiring redemption by transferring asset at specified or determinable date or upon event certain to occur. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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