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Note 11 - Investment Securities - Summary of Securities (Details) - USD ($) $ in Thousands | Mar. 26, 2022 | Sep. 25, 2021
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Held-to-maturity securities, amortized cost | $ 4,530 | $ 12,027
Held-to-maturity securities, gross unrealized gains | 2 | 123
Held-to-maturity securities, gross unrealized losses | 59 | 18
Held-to-maturity securities, fair market value | 4,473 | 12,132
Investment securities, cost | 6,404 | 10,480
Investment securities, gross unrealized gains | 96 | 175
Investment securities, gross unrealized losses | 549 | 571
Investment securities, fair market value | 5,951 | 10,084
Corporate Bond Securities [Member] |  |
Held-to-maturity securities, amortized cost | 4,530 | 12,027
Held-to-maturity securities, gross unrealized gains | 2 | 123
Held-to-maturity securities, gross unrealized losses | 59 | 18
Held-to-maturity securities, fair market value | 4,473 | 12,132
Mutual Funds [Member] |  |
Investment securities, cost | 3,588 | 3,588
Investment securities, gross unrealized gains | 0 | 0
Investment securities, gross unrealized losses | 549 | 536
Investment securities, fair market value | 3,039 | 3,052
Preferred Stock [Member] |  |
Investment securities, cost | 2,816 | 6,892
Investment securities, gross unrealized gains | 96 | 175
Investment securities, gross unrealized losses | 0 | 35
Investment securities, fair market value | $ 2,912 | $ 7,032

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- Definition Accumulated amount of unrealized loss on investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). + References No definition available. + Details
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