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Note 4 - Financial Instruments, Investments and Fair Value Measurements (Details Textual) - USD ($)
$ in Thousands
12 Months Ended
Nov. 25, 2023
Nov. 26, 2022
Short-Term Investments $ 17,775 $ 17,715
Minimum [Member]    
Certificates of Deposit, Average Term 6 months  
Interest Rate of Certificates of Deposit 0.70%  
Maximum [Member]    
Certificates of Deposit, Average Term 12 months  
Interest Rate of Certificates of Deposit 5.45%  
Weighted Average [Member]    
Interest Rate of Certificates of Deposit 5.10%  
Certificates of Deposit [Member]    
Short-Term Investments $ 17,775 $ 17,715