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Note 2 - Other Assets (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended |  | 6 Months Ended |  | 3 Months Ended | 6 Months Ended
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Dec. 31, 2013 | Jun. 30, 2014 | Jun. 30, 2014 SAP Enterprise Software And SAP Dealership Management System [Member] Sales Revenue, Net [Member] | Jun. 30, 2014 Rush Truck Centers [Member] | Jun. 30, 2014 Computer Software, Intangible Asset [Member] | Jun. 30, 2013 Computer Software, Intangible Asset [Member] | Jun. 30, 2014 Computer Software, Intangible Asset [Member] | Jun. 30, 2013 Computer Software, Intangible Asset [Member]
Note 2 - Other Assets (Details) [Line Items] |  |  |  |  |  |  |  |
Capitalized Computer Software, Net |  | $ 39.5 |  |  |  |  |  |
Capitalized Computer Software, Accumulated Amortization |  | 8.7 |  |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life |  |  |  |  |  |  | 15 years |
Number of Stores |  |  |  | 64 |  |  |  |
Concentration Risk, Percentage |  |  | 68.00% |  |  |  |  |
Amortization of Intangible Assets |  |  |  |  | 0.8 | 0.7 | 1.6 | 1.5
Finite-Lived Intangible Assets, Amortization Expense, Year Two |  | 3.3 |  |  |  |  |  |
Finite-Lived Intangible Assets, Amortization Expense, Year Three |  | 3.3 |  |  |  |  |  |
Finite-Lived Intangible Assets, Amortization Expense, Year Four |  | 3.3 |  |  |  |  |  |
Finite-Lived Intangible Assets, Amortization Expense, Year Five |  | 3.3 |  |  |  |  |  |
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months |  | 3.3 |  |  |  |  |  |
Indefinite-Lived Franchise Rights | 4.5 | 4.5 |  |  |  |  |  |
Goodwill and Intangible Asset Impairment | $ 0 |  |  |  |  |  |  |

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