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Note C - Investment Securities - Summary of Securities (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Sep. 24, 2022
Held-to-maturity securities, amortized cost $ 4,011  
Marketable securities available for sale, amortized cost   $ 6,404
Held-to-maturity securities, gross unrealized gains 0  
Marketable securities available for sale, gross unrealized gains   46
Held-to-maturity securities, gross unrealized losses 21  
Marketable securities available for sale, gross unrealized losses   742
Held-to-maturity securities, fair market value 3,990 3,990
Marketable securities available for sale, fair market value   5,708
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  
Mutual Funds [Member]    
Marketable securities available for sale, amortized cost   3,588
Marketable securities available for sale, gross unrealized gains   0
Marketable securities available for sale, gross unrealized losses   742
Marketable securities available for sale, fair market value   2,846
Preferred Stock [Member]    
Marketable securities available for sale, amortized cost   2,816
Marketable securities available for sale, gross unrealized gains   46
Marketable securities available for sale, gross unrealized losses   0
Marketable securities available for sale, fair market value   $ 2,862