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Note 2 - Significant Accounting Policies (Details Textual) - USD ($)
$ in Thousands
12 Months Ended
May 02, 2022
Jan. 03, 2022
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Feb. 25, 2019
Depreciation     $ 207,300 $ 194,100 $ 177,100  
Amortization     28,800 27,000 22,100  
Indefinite-Lived Franchise Rights     12,000 12,000    
Goodwill and Intangible Asset Impairment     0 0 0  
Advertising Expense     11,300 10,000 8,700  
Capitalized Computer Software, Net     1,800 3,000    
Capitalized Computer Software, Accumulated Amortization     17,200 16,000    
RTC Canada [Member]            
Business Acquisition, Percentage of Voting Interests Acquired 30.00%          
Business Combination, Consideration Transferred $ 20,000          
RTC Canada [Member] | RTC Canada [Member]            
Subsidiary, Ownership Percentage, Noncontrolling Owner 20.00%          
Rush Truck Centres of Canada Limited [Member]            
Equity Method Investment, Ownership Percentage           50.00%
Momentum Fuel Technologies [Member]            
Equity Method Investment, Ownership Percentage   50.00%        
Payments to Acquire Equity Method Investments   $ 27,500        
Acquisition of Equity Method Investments, Realized Gain (Loss)   $ 12,500        
Vehicles [Member]            
Depreciation     167,600 $ 161,300 $ 143,500  
Finance Lease, Right-of-Use Asset, after Accumulated Amortization     122,400      
Finance Lease, Right-of-Use Asset, Accumulated Amortization     $ 66,900