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Note C - Investment Securities (Details Textual) - USD ($)
$ in Thousands
12 Months Ended
Sep. 24, 2022
Sep. 25, 2021
Sep. 26, 2020
Proceeds from Sale and Maturity of Marketable Securities $ 12,026 $ 60,891 $ 73,226
Marketable Securities, Gain (Loss) 300 200 $ 100
Marketable Securities, Unrealized Gain (Loss) (300) 800  
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss, Total 4,011 $ 12,027  
BBB/BB/B Rating [Member]      
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss, Total $ 4,000    
Mutual Fund [Member]      
Marketable Securities, Annual Income, Percentage 3.70%    
Marketable Securities, Total $ 3,000    
Preferred Stock [Member]      
Marketable Securities, Annual Income, Percentage 5.50%    
Marketable Securities, Annual Income, Percentage, not Subject to Tax 50.00%    
Corporate Bond Securities [Member]      
Marketable Securities, Annual Income, Percentage 3.30%    
Marketable Securities, Total $ 4,000    
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, without Single Maturity Date $ 4,000