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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