Note 11 (Details Textual) - USD ($)	3 Months Ended		6 Months Ended
	Mar. 26, 2022	Mar. 27, 2021	Mar. 26, 2022	Mar. 27, 2021	Sep. 25, 2021
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss, Total	$ 4,530,000		$ 4,530,000		$ 12,027,000
Proceeds from Sale and Maturity of Marketable Securities	4,326,000	$ 15,189,000	11,526,000	$ 41,337,000
Marketable Securities, Gain (Loss)	(25,000)	41,000	(69,000)	119,000
Marketable Securities, Unrealized Gain (Loss)	(53,000)	$ (46,000)	(58,000)	$ 649,000
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