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Note 11 (Details Textual) - USD ($)	3 Months Ended
	Dec. 25, 2021	Dec. 26, 2020	Sep. 25, 2021
Proceeds from Sale and Maturity of Marketable Securities, Total	$ 7,200,000	$ 26,148,000
Marketable Securities, Gain (Loss), Total	(44,000)	(78,000)
Marketable Securities, Unrealized Gain (Loss), Total	(5,000)	$ 603,000
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss, Total	7,544,000		$ 12,027,000
Corporate Bond Securities [Member]
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, without Single Maturity Date	$ 8,000,000
Investment Securities Maturity Term (Year)	2 years

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

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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 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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