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Note 2 - Other Assets (Details Textual) $ in Thousands, $ in Millions | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) | Apr. 25, 2019 CAD ($) | Feb. 25, 2019 | Dec. 31, 2018 USD ($)
Capitalized Computer Software, Net, Ending Balance | $ 9,400 |  | $ 9,400 |  |  |  |
Capitalized Computer Software, Amortization | 500 | $ 500 | 1,400 | $ 21,200 |  |  |
Indefinite-Lived Franchise Rights | 7,000 |  | 7,000 |  |  |  | $ 7,000
Goodwill and Intangible Asset Impairment, Total |  |  | 0 |  |  |  |
Financial Guarantee [Member] |  |  |  |  |  |  |
Guarantor Obligations, Maximum Exposure, Undiscounted |  |  |  |  | $ 250 |  |
Other Noncurrent Liabilities [Member] | Financial Guarantee [Member] |  |  |  |  |  |  |
Guarantor Obligations, Current Carrying Value | 5,000 |  | 5,000 |  |  |  |
Rush Truck Centres of Canada Limited [Member] |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage |  |  |  |  |  | 50.00% |
Rush Truck Centres of Canada Limited [Member] | Other Assets [Member] |  |  |  |  |  |  |
Equity Method Investments | 25,200 |  | 25,200 |  |  |  |
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] | Call Option [Member] | Other Assets [Member] |  |  |  |  |  |  |
Call Option, Fair Value Disclosure | 3,600 |  | 3,600 |  |  |  |
Computer Software, Intangible Asset [Member] |  |  |  |  |  |  |
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months | 1,900 |  | 1,900 |  |  |  |
Finite-Lived Intangible Assets, Amortization Expense, Year Two | 1,900 |  | 1,900 |  |  |  |
Finite-Lived Intangible Assets, Amortization Expense, Year Three | 1,900 |  | 1,900 |  |  |  |
Finite-Lived Intangible Assets, Amortization Expense, Year Four | 1,900 |  | 1,900 |  |  |  |
Finite-Lived Intangible Assets, Amortization Expense, Year Five | $ 1,900 |  | $ 1,900 |  |  |  |
Components of ERP Platform Rquired Replacement [Member] |  |  |  |  |  |  |
Capitalized Computer Software, Amortization |  |  |  | $ 19,900 |  |  |

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