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Note C - Investment Securities (Details Textual) - USD ($)	12 Months Ended
	Sep. 26, 2020	Sep. 28, 2019	Sep. 29, 2018
Proceeds from Sale and Maturity of Marketable Securities, Total	$ 73,226,000	$ 39,158,000	$ 75,302,000
Marketable Securities, Gain (Loss), Total	83,000	27,000
Marketable Securities, Unrealized Gain (Loss), Total	$ (965,000)	$ (431,000)	$ (140,000)
Mutual Fund [Member]
Marketable Securities, Annual Income, Percentage	5.00%
Preferred Stock [Member]
Marketable Securities, Annual Income, Percentage	4.20%
Marketable Securities, Total	$ 11,000,000
Marketable Securities, Annual Income, Percentage, not Subject to Tax	50.00%
Corporate Bond Securities [Member]
Marketable Securities, Annual Income, Percentage	2.80%
Marketable Securities, Total	$ 68,000,000
Debt Securities, Held-to-maturity, Maturity, without Single Maturity Date, Amortized Cost	$ 51,000,000

X

- Definition

The annual income percentage generated by debt and equity financial instruments including: (1) securities held-to-maturity, (2) trading securities, and (3) securities available-for-sale.

+ References

No definition available.

+ Details

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- Definition

The percentage of annual income percentage from debt and equity financial instruments including: (1) securities held-to-maturity, (2) trading securities, and (3) securities available-for-sale that is not subject to tax.

+ References

No definition available.

+ Details

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- Definition

Amortized cost of investment in debt security measured at amortized cost (held-to-maturity), without single maturity date and not allocated over maturity grouping.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5
-Subparagraph (f)
-URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27232-111563

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- Definition

Amount of investment in marketable security.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.4)
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

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- Definition

Amount of unrealized and realized gain (loss) on investment in marketable security, including other-than-temporary impairment (OTTI).

+ References

No definition available.

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Amount of unrealized gain (loss) on investment in marketable security.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(7)(c))
-URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227

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- Definition

The cash inflow associated with the aggregate amount received by the entity through sale or maturity of marketable securities (held-to-maturity or available-for-sale) during the period.

+ References

No definition available.

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