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Note 2 - Other Assets (Details) (USD $) In Millions, unless otherwise specified |  |  | 3 Months Ended |  | 3 Months Ended
--- | --- | --- | --- | --- | ---
Mar. 31, 2014 | Dec. 31, 2013 | Mar. 31, 2014 SAP Enterprise Software And SAP Dealership Management System [Member] Sales Revenue, Net [Member] | Mar. 31, 2014 Rush Truck Centers [Member] | Mar. 31, 2014 Computer Software, Intangible Asset [Member] | Mar. 31, 2013 Computer Software, Intangible Asset [Member]
Note 2 - Other Assets (Details) [Line Items] |  |  |  |  |  |
Capitalized Computer Software, Net | $ 39.8 |  |  |  |  |
Capitalized Computer Software, Accumulated Amortization | 7.9 |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life |  |  |  |  | 15 years |
Number of Stores |  |  |  | 55 |  |
Concentration Risk, Percentage |  |  | 60.00% |  |  |
Amortization of Intangible Assets |  |  |  |  | 0.8 | 0.7
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months | 3.3 |  |  |  |  |
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 |  |  |  |  |
Indefinite-Lived Franchise Rights | $ 4.5 | $ 4.5 |  |  |  |

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- Definition Carrying amount (original costs adjusted for previously recognized amortization and impairment) as of the balance sheet date for the rights acquired through a franchise arrangement having an indefinite period of benefit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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