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Note 13 - Investments - Summary of Securities (Details) - USD ($) $ in Thousands | Dec. 24, 2022 | Sep. 24, 2022
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Held-to-maturity securities, amortized cost | $ 2,008 | $ 4,011
Investment securities, cost | 5,107 | 6,404
Held-to-maturity securities, gross unrealized gains | 0 | 0
Investment securities, gross unrealized gains | 38 | 46
Held-to-maturity securities, gross unrealized losses | 10 | 21
Investment securities, gross unrealized losses | 774 | 742
Held-to-maturity securities, fair market value | 1,998 | 3,990
Investment securities, fair market value | 4,371 | 5,708
Corporate Bond Securities [Member] |  |
Held-to-maturity securities, amortized cost | 2,008 | 4,011
Held-to-maturity securities, gross unrealized gains | 0 | 0
Held-to-maturity securities, gross unrealized losses | 10 | 21
Held-to-maturity securities, fair market value | 1,998 | 3,990
Mutual Funds [Member] |  |
Investment securities, cost | 3,588 | 3,588
Investment securities, gross unrealized gains | 0 | 0
Investment securities, gross unrealized losses | 774 | 742
Investment securities, fair market value | 2,814 | 2,846
Preferred Stock [Member] |  |
Investment securities, cost | 1,519 | 2,816
Investment securities, gross unrealized gains | 38 | 46
Investment securities, gross unrealized losses | 0 | 0
Investment securities, fair market value | $ 1,557 | $ 2,862

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