Note 13 - Investments - Summary of Securities (Details) - USD ($) $ in Thousands	Mar. 25, 2023	Sep. 24, 2022
Investment securities, amortized cost	$ 5,107	$ 6,404
Held-to-maturity securities, amortized cost		4,011
Investment securities, gross unrealized gains	61	46
Held-to-maturity securities, gross unrealized gains		0
Investment securities, gross unrealized losses	739	742
Held-to-maturity securities, gross unrealized losses		21
Investment securities, gross unrealized losses	4,429	5,708
Held-to-maturity securities, fair market value	0	3,990
Mutual Funds [Member]
Investment securities, amortized cost	3,588	3,588
Investment securities, gross unrealized gains	0	0
Investment securities, gross unrealized losses	739	742
Investment securities, gross unrealized losses	2,849	2,846
Corporate Bond Securities [Member]
Held-to-maturity securities, amortized cost		4,011
Held-to-maturity securities, gross unrealized gains		0
Held-to-maturity securities, gross unrealized losses		21
Held-to-maturity securities, fair market value		3,990
Preferred Stock [Member]
Investment securities, amortized cost	1,519	2,816
Investment securities, gross unrealized gains	61	46
Investment securities, gross unrealized losses	0	0
Investment securities, gross unrealized losses	$ 1,580	$ 2,862