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Note 13 (Details Textual) - USD ($)	3 Months Ended		9 Months Ended
	Jun. 25, 2022	Jun. 26, 2021	Jun. 25, 2022	Jun. 26, 2021	Sep. 25, 2021
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss, Total	$ 4,520,000		$ 4,520,000		$ 12,027,000
Proceeds from Sale and Maturity of Marketable Securities	0	$ 12,854,000	11,526,000	$ 54,191,000
Marketable Securities, Gain (Loss)	(343,000)	21,000	(412,000)	139,000
Marketable Securities, Unrealized Gain (Loss)	(401,000)	$ (343,000)	786,000	$ 137,000
External Credit Rating, Investment Grade [Member]
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss, Total	4,520,000		4,520,000
Corporate Bond Securities [Member]
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss, Total	$ 4,500,000		$ 4,500,000
Investment Securities Maturity Term (Month)			12 months

X

- Definition

The maturity term of investment securities in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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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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-URI https://asc.fasb.org/extlink&oid=124255206&loc=SL82895884-210446

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

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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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