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Note 2 - Other Assets (Details Textual) - USD ($)
$ in Millions
May 02, 2022
Jan. 03, 2022
Jun. 30, 2022
Feb. 25, 2019
Rush Truck Centres of Canada Limited [Member]        
Noncontrolling Interest, Ownership Percentage by Parent     80.00%  
Rush Truck Centres of Canada Limited [Member]        
Equity Method Investment, Ownership Percentage       50.00%
Payments to Acquire Equity Method Investments $ 20.0      
Rush Truck Centres of Canada Limited [Member] | Call Option [Member]        
Equity Method Investment, Remaining Ownership Percentage Not Yet Acquired       50.00%
Rush Truck Centres of Canada Limited [Member] | Rush Truck Centres of Canada Limited [Member]        
Business Acquisition, Percentage of Voting Interests Acquired     30.00%  
Momentum Fuel Technologies [Member]        
Payments to Acquire Equity Method Investments   $ 27.5    
Equity Method Investments     $ 14.8  
Momentum Fuel Technologies [Member] | Other Income [Member]        
Acquisition of Equity Method Investments, Realized Gain (Loss)   $ 12.5