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Note 12 - Fair Value of Financial Instruments - Estimate Fair Value of Financial Instruments (Details)	Sep. 29, 2019 $ / shares yr	Sep. 30, 2018 $ / shares yr	Sep. 24, 2017 $ / shares yr
Measurement Input, Price Volatility [Member]
Warrant and rights, measurement input	0.48	0.31	0.37
Measurement Input, Risk Free Interest Rate [Member]
Warrant and rights, measurement input	0.0158	0.0291	0.0181
Measurement Input, Expected Term [Member]
Warrant and rights, measurement input | yr	2.5	3.5	4.5
Measurement Input, Share Price [Member]
Warrant and rights, measurement input | $ / shares	0.2	0.3	0.26

X

- 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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