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Note C - Investment Securities - Summary of Securities (Details) - USD ($) $ in Thousands | Sep. 26, 2020 | Sep. 28, 2019
--- | --- | ---
Held-to-maturity securities, amortized cost | $ 68,078 | $ 130,451
Held-to-maturity securities, gross unrealized gains | 1,015 | 1,210
Held-to-maturity securities, gross unrealized losses | 32 | 36
Held-to-maturity securities, fair market value | 69,061 | 131,625
Marketable securities available for sale, amortized cost | 15,184 | 20,147
Marketable securities available for sale, gross unrealized gains | 116 | 266
Marketable securities available for sale, gross unrealized losses | 1,324 | 510
Marketable securities available for sale, fair value | 13,976 | 19,903
Corporate Bond Securities [Member] |  |
Held-to-maturity securities, amortized cost | 68,078 | 127,571
Held-to-maturity securities, gross unrealized gains | 1,015 | 1,204
Held-to-maturity securities, gross unrealized losses | 32 | 36
Held-to-maturity securities, fair market value | 69,061 | 128,739
Mutual Funds [Member] |  |
Marketable securities available for sale, amortized cost | 3,588 | 5,549
Marketable securities available for sale, gross unrealized gains | 0 | 0
Marketable securities available for sale, gross unrealized losses | 738 | 495
Marketable securities available for sale, fair value | 2,850 | 5,054
Preferred Stock [Member] |  |
Marketable securities available for sale, amortized cost | 11,596 | 14,598
Marketable securities available for sale, gross unrealized gains | 116 | 266
Marketable securities available for sale, gross unrealized losses | 586 | 15
Marketable securities available for sale, fair value | $ 11,126 | 14,849
Certificates of Deposit [Member] |  |
Held-to-maturity securities, amortized cost |  | 2,880
Held-to-maturity securities, gross unrealized gains |  | 6
Held-to-maturity securities, gross unrealized losses |  | 0
Held-to-maturity securities, fair market value |  | $ 2,886

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