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Note F - Debt Facilities (Details Textual) - USD ($)
9 Months Ended
Sep. 29, 2021
Oct. 29, 2020
Jan. 31, 2022
Jan. 31, 2021
Sep. 28, 2021
Apr. 30, 2021
Feb. 10, 2021
Dec. 31, 2020
Sep. 30, 2019
Sep. 29, 2019
Amortization of Debt Issuance Costs and Discounts, Total     $ 559,000 $ 266,000            
Payments of Financing Costs, Total     1,800,000 $ 282,000            
Debt Issuance Costs, Gross     $ 1,900,000     $ 678,000        
Minimum [Member]                    
Financing Receivable Payment Period (Month)     18 months              
Minimum [Member] | Medium-term Vehicle Contracts [Member]                    
Financing Receivable Payment Period (Month)   36 months                
Minimum [Member] | Long-term Vehicle Contracts [Member]                    
Financing Receivable Payment Period (Month)   42 months                
Maximum [Member]                    
Financing Receivable Payment Period (Month)     54 months              
Maximum [Member] | Medium-term Vehicle Contracts [Member]                    
Financing Receivable Payment Period (Month)   42 months                
Maximum [Member] | Long-term Vehicle Contracts [Member]                    
Financing Receivable Payment Period (Month)   60 months                
BMO Harris Bank [Member] | Line of Credit [Member]                    
Line of Credit Facility, Maximum Borrowing Capacity               $ 326,000,000    
Debt Instrument, Covenant, Maximum Borrowing Base, Percentage of Financing Receivables   15.00%                
Debt Instrument, Covenant, Maximum Aggregate Consideration for Businesses Acquired in One Year   $ 20,000,000.0                
Debt Instrument, Covenant, Maximum Disposal of Real Estate   5,000,000.0                
Debt Instrument, Covenant, Maximum Disposal Other Properties   $ 1,000,000.0                
Line of Credit Facility, Total Increase in Borrowing Capacity               $ 85,000,000    
Maximum Allowable Capital Expenditures By Credit Facilities Amendment             $ 10,000,000      
BMO Harris Bank [Member] | Medium-term Vehicle Contracts [Member] | Line of Credit [Member]                    
Debt Instrument, Covenant, Maximum Borrowing Base, Percentage of Financing Receivables   15.00%                
BMO Harris Bank [Member] | Long-term Vehicle Contracts [Member] | Line of Credit [Member]                    
Debt Instrument, Covenant, Maximum Borrowing Base, Percentage of Financing Receivables   5.00%                
Revolving Credit Facility [Member]                    
Line of Credit Facility, Additional Borrowing Capacity, Accordion Feature     $ 84,400,000              
Revolving Credit Facility [Member] | BMO Harris Bank [Member]                    
Line of Credit Facility, Maximum Borrowing Capacity $ 600,000,000       $ 326,000,000       $ 241,000,000 $ 215,000,000
Line of Credit Facility, Additional Borrowing Capacity, Accordion Feature 100,000,000               100,000,000 50,000,000
Maximum Allowable Capital Expenditures By Credit Facilities Amendment 35,000,000       $ 25,000,000   $ 25,000,000      
Line of Credit Facility, Increase In Maximum Borrowing Capacity $ 274,000,000                  
Debt Instrument, Interest Rate, Effective Percentage     2.85%     2.85%        
Revolving Credit Facility [Member] | BMO Harris Bank [Member] | London Interbank Offered Rate (LIBOR) [Member]                    
Debt Instrument, Basis Spread on Variable Rate     2.35%              
Revolving Credit Facility [Member] | BMO Harris Bank [Member] | Minimum [Member]                    
Debt Instrument, Interest Rate, Stated Percentage     2.85%              
Colonial Revolving Credit Facility [Member] | BMO Harris Bank [Member]                    
Line of Credit Facility, Maximum Borrowing Capacity                 231,000,000 $ 205,000,000
ACM TCM Revolving Credit Facility [Member] | BMO Harris Bank [Member]                    
Line of Credit Facility, Maximum Borrowing Capacity                 $ 10,000,000