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Note C - Investment Securities (Details Textual) - USD ($)	12 Months Ended
	Sep. 25, 2021	Sep. 26, 2020	Sep. 28, 2019	Sep. 30, 2021
Proceeds from Sale and Maturity of Marketable Securities, Total	$ 60,891,000	$ 73,226,000	$ 39,158,000
Marketable Securities, Gain (Loss), Total	213,000	83,000	$ 27,000
Marketable Securities, Unrealized Gain (Loss), Total	(813,000)	(965,000)
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss, Total	12,027,000	$ 68,078,000
External Credit Rating, Investment Grade [Member]
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss, Total	$ 1,469,000			$ 10,558,000
Mutual Fund [Member]
Marketable Securities, Annual Income, Percentage	3.50%
Preferred Stock [Member]
Marketable Securities, Annual Income, Percentage	5.90%
Marketable Securities, Total	$ 7,000,000
Marketable Securities, Annual Income, Percentage, not Subject to Tax	50.00%
Corporate Bond Securities [Member]
Marketable Securities, Annual Income, Percentage	3.10%
Marketable Securities, Total	$ 12,000,000
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, without Single Maturity Date	$ 8,000,000

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.

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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.

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- Definition

Amount, before allowance for credit loss, of investment in debt security measured at amortized cost (held-to-maturity).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
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Amount, after allowance for credit loss, of investment in debt security measured at amortized cost (held-to-maturity) without single maturity date and not allocated over maturity grouping.

+ References

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Amount of investment in marketable security.

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

+ References

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

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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.

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