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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

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