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Note 11 - Stock Ownership Plans - Summary of Stock Options Outstanding (Details)	12 Months Ended
	Sep. 27, 2020 $ / shares shares
Number outstanding (in shares) | shares	412
Weighted Average Remaining Contractual Life (Year)	1 year 8 months 12 days
Weighted Average Exercise Price, Outstanding (in dollars per share)	$ 1.14
Number Exercisable (in shares) | shares	412
Weighted Average Exercise Price, Exercisable (in dollars per share)	$ 1.14
Exercise Price Range 1 [Member]
Range of exercise prices, lower limit (in dollars per share)	1
Range of exercise prices, upper limit (in dollars per share)	$ 2
Number outstanding (in shares) | shares	412
Weighted Average Remaining Contractual Life (Year)	1 year 8 months 12 days
Weighted Average Exercise Price, Outstanding (in dollars per share)	$ 1.14
Number Exercisable (in shares) | shares	412
Weighted Average Exercise Price, Exercisable (in dollars per share)	$ 1.14
Exercise Price Range 2 [Member]
Range of exercise prices, lower limit (in dollars per share)	2
Range of exercise prices, upper limit (in dollars per share)	$ 3
Number outstanding (in shares) | shares	0
Weighted Average Exercise Price, Outstanding (in dollars per share)	$ 0
Number Exercisable (in shares) | shares	0
Weighted Average Exercise Price, Exercisable (in dollars per share)	$ 0

X

- Definition

The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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- Definition

The number of shares reserved for issuance pertaining to the outstanding exercisable stock options as of the balance sheet date in the customized range of exercise prices for which the market and performance vesting condition has been satisfied.

+ References

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-Publisher FASB
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X

- Definition

The number of shares reserved for issuance pertaining to the outstanding stock options as of the balance sheet date for all option plans in the customized range of exercise prices.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(i)-(ii)
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- Definition

The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

+ References

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-Topic 718
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- Definition

Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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X

- Definition

The weighted average price as of the balance sheet date at which grantees could acquire the underlying shares with respect to all outstanding stock options which are in the customized range of exercise prices.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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X

- Definition

Weighted average remaining contractual term of outstanding stock options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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-Name Accounting Standards Codification
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