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Note F - Long-term Debt (Details Textual) - USD ($)
$ in Thousands
 1 Months Ended 12 Months Ended
Dec. 31, 2021
Sep. 27, 2025
Sep. 28, 2024
Jun. 21, 2022
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration]   Federal Funds Rate [Member]    
Letters of Credit Outstanding, Amount   $ 14,800 $ 12,300  
The Amended Credit Agreement [Member]        
Long-Term Line of Credit   0 0  
Line of Credit Facility, Remaining Borrowing Capacity   210,200 212,700  
Letters of Credit Outstanding, Amount   $ 14,800 $ 12,300  
The Amended Credit Agreement [Member] | Revolving Credit Facility [Member]        
Line of Credit Facility, Maximum Borrowing Capacity $ 50,000      
Line Of Credit Facility Increase In Maximum Borrowing Capacity       $ 175,000
Line of Credit Facility, Options to Increase Size of Credit Facility, Value 1       225,000
Line of Credit Facility, Options to Increase Size of Credit Facility, Value 2       $ 50,000
The Credit Agreement [Member]        
Debt Instrument, Basis Spread on Variable Rate 0.50%