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Note 2 - Significant Accounting Policies (Details) (USD $)
 3 Months Ended 12 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2013
Cash Flow Hedging [Member]
Interest Rate Swap [Member]
Dec. 31, 2013
Vehicles [Member]
Dec. 31, 2013
SAP Enterprise Software And SAP Dealership Management System [Member]
Sales Revenue, Net [Member]
Dec. 31, 2013
Rush Truck Centers [Member]
May 31, 2013
Former Chairman [Member]
Dec. 31, 2013
Former Chairman [Member]
Dec. 31, 2013
Computer Software, Intangible Asset [Member]
Dec. 31, 2012
Computer Software, Intangible Asset [Member]
Dec. 31, 2011
Computer Software, Intangible Asset [Member]
Note 2 - Significant Accounting Policies (Details) [Line Items]                          
Interest Costs Capitalized                     $ 128,000    
Capital Leases, Lessee Balance Sheet, Assets by Major Class, Other Property, Plant, and Equipment, Net           43,600,000              
Capital Leases, Lessee Balance Sheet, Assets by Major Class, Property, Plant, and Equipment Other, Accumulated Depreciation           21,700,000              
Depreciation   82,300,000 62,300,000                    
Amortization   11,200,000 11,000,000                    
Goodwill and Intangible Asset Impairment 0                        
Capitalized Computer Software, Net 40,800,000 40,800,000                 40,800,000 40,900,000  
Capitalized Computer Software, Accumulated Amortization 7,100,000 7,100,000                 7,100,000 4,100,000  
Finite-Lived Intangible Asset, Useful Life                     15 years    
Number of Stores               48          
Concentration Risk, Percentage             65.00%            
Amortization of Intangible Assets                     3,000,000 3,000,000 1,300,000
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months 3,200,000 3,200,000                      
Finite-Lived Intangible Assets, Amortization Expense, Year Two 3,200,000 3,200,000                      
Finite-Lived Intangible Assets, Amortization Expense, Year Three 3,200,000 3,200,000                      
Finite-Lived Intangible Assets, Amortization Expense, Year Four 3,200,000 3,200,000                      
Finite-Lived Intangible Assets, Amortization Expense, Year Five 3,200,000 3,200,000                      
Indefinite-Lived Franchise Rights 4,500,000 4,500,000 4,500,000                    
Pension and Other Postretirement Benefit Expense                 10,800,000 10,800,000      
Postemployment Benefits Liability, Current                   1,000,000      
Postemployment Benefits Liability, Noncurrent                   2,000,000      
Advertising Expense   6,800,000 4,400,000 3,700,000                  
Derivative Asset, Notional Amount         $ 38,400,000