Note 6 - Pension Plans - Fair Value Hierarchy of Benefit Plan Assets (Details) - Pension Plan [Member] - USD ($) $ in Thousands	Sep. 29, 2019	Sep. 30, 2018
Fair Value Measured at Net Asset Value Per Share [Member]
Cash and cash equivalents
Debt securities
Hedge fund investments	15,733	15,767
Fair Value Measured at Net Asset Value Per Share [Member] \| Domestic Equity Securities [Member]
Equity Securities, FV-NI	9,524	10,045
Fair Value Measured at Net Asset Value Per Share [Member] \| Foreign Equity Securities [Member]
Equity Securities, FV-NI
Fair Value Measured at Net Asset Value Per Share [Member] \| US Treasury Securities [Member]
Equity Securities, FV-NI
Fair Value, Inputs, Level 1 [Member]
Cash and cash equivalents	2,970	5,537
Debt securities	26,392	25,673
Hedge fund investments
Fair Value, Inputs, Level 1 [Member] \| Domestic Equity Securities [Member]
Equity Securities, FV-NI	8,971	12,573
Fair Value, Inputs, Level 1 [Member] \| Foreign Equity Securities [Member]
Equity Securities, FV-NI	6,525	7,070
Fair Value, Inputs, Level 1 [Member] \| US Treasury Securities [Member]
Equity Securities, FV-NI	6,918	6,535
Fair Value, Inputs, Level 2 [Member]
Cash and cash equivalents
Debt securities	24,190	22,523
Hedge fund investments
Fair Value, Inputs, Level 2 [Member] \| Domestic Equity Securities [Member]
Equity Securities, FV-NI	40,593	40,083
Fair Value, Inputs, Level 2 [Member] \| Foreign Equity Securities [Member]
Equity Securities, FV-NI	7,283	7,560
Fair Value, Inputs, Level 2 [Member] \| US Treasury Securities [Member]
Equity Securities, FV-NI
Fair Value, Inputs, Level 3 [Member]
Cash and cash equivalents
Debt securities
Hedge fund investments
Fair Value, Inputs, Level 3 [Member] \| Domestic Equity Securities [Member]
Equity Securities, FV-NI
Fair Value, Inputs, Level 3 [Member] \| Foreign Equity Securities [Member]
Equity Securities, FV-NI
Fair Value, Inputs, Level 3 [Member] \| US Treasury Securities [Member]
Equity Securities, FV-NI

Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

No definition available.

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- Definition

Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 45
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=99377092&loc=SL75136599-209740

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- Definition

Fair value of all derivative assets designated as fair value hedging instruments.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4B
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624163-113959

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- Definition

Fair value of investment in debt security measured at amortized cost (held-to-maturity).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5
-Subparagraph (aa)
-URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27232-111563

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