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Note F - Debt Facilities (Details Textual) - USD ($)
9 Months Ended
Oct. 29, 2020
Mar. 29, 2018
Dec. 15, 2015
Jan. 31, 2021
Jan. 31, 2020
Feb. 10, 2021
Dec. 31, 2020
Apr. 30, 2020
Sep. 30, 2019
Sep. 29, 2019
Line of Credit Facility, Additional Borrowing Capacity, Accordion Feature       $ 115,000,000            
Amortization of Debt Issuance Costs and Discounts, Total       266,000 $ 191,000          
Payments of Debt Issuance Costs       282,000 $ 459,000          
Debt Issuance Costs, Gross       803,000       $ 787,000    
Finance Lease, Liability, Total       81,000       445,000    
Finance Lease, Right-of-Use Asset, Accumulated Amortization       $ 463,000       340,000    
Assets Under Finance Lease [Member]                    
Property, Plant and Equipment, Useful Life (Year)   3 years                
Note Payable Related to the Property Purchase Agreement [Member]                    
Debt Instrument, Face Amount     $ 550,000              
Debt Instrument, Periodic Payment, Total     $ 10,005              
Debt Instrument, Interest Rate, Stated Percentage     3.50%              
Long-term Debt, Total               $ 79,000    
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)       48 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] | Line of Credit [Member] | Subsequent Event [Member]                    
Maximum Allowable Capital Expenditures By Credit Facilities Amendment           $ 25,000,000        
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] | BMO Harris Bank [Member]                    
Line of Credit Facility, Maximum Borrowing Capacity                 $ 241,000,000 $ 215,000,000
Line of Credit Facility, Additional Borrowing Capacity, Accordion Feature                 100,000,000 50,000,000
Debt Instrument, Interest Rate, Effective Percentage       2.85%       2.98%    
Revolving Credit Facility [Member] | BMO Harris Bank [Member] | London Interbank Offered Rate (LIBOR) [Member]                    
Debt Instrument, Basis Spread on Variable Rate       2.35%            
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