Note 13 - Investments (Details Textual) - USD ($)	3 Months Ended		6 Months Ended
	Mar. 25, 2023	Mar. 26, 2022	Mar. 25, 2023	Mar. 26, 2022
Proceeds from Sale and Maturity of Marketable Securities	$ 2,000,000.0	$ 4,300,000	$ 5,300,000	$ 11,526,000
Marketable Securities, Gain (Loss)	59,000	(25,000)	22,000	(69,000)
Marketable Security, Unrealized Gain (Loss)	$ 59,000	$ (53,000)	$ 19,000	$ (58,000)