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Note 2 - Significant Accounting Policies (Details Textual) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Feb. 25, 2019
Depreciation, Total | $ 148,300 | $ 157,800 | $ 158,700 |
Amortization, Total | 21,200 | 19,500 | 16,800 |
Goodwill, Impairment Loss | 0 |  |  |
Capitalized Computer Software, Net, Ending Balance | 5,500 | 7,000 |  |
Capitalized Computer Software, Amortization | 1,500 | 1,900 |  |
Indefinite-Lived Franchise Rights | 8,600 | 7,000 |  |
Advertising Expense | 7,500 | 7,900 | $ 11,500 |
Capitalized Computer Software, Accumulated Amortization | 13,600 | 12,100 |  |
Other Noncurrent Liabilities [Member] | Financial Guarantee [Member] |  |  |  |
Guarantor Obligations, Current Carrying Value | 5,200 | 5,200 |  |
Equity Method Investments | 36,700 |  |  |
Rush Truck Centres of Canada Limited [Member] |  |  |  |
Equity Method Investment, Ownership Percentage |  |  | 50.00% | 50.00%
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 |  |  |
Computer Software, Intangible Asset [Member] |  |  |  |
Finite-Lived Intangible Asset, Expected Amortization, Year One | 1,200 |  |  |
Finite-Lived Intangible Asset, Expected Amortization, Year Two | 1,200 |  |  |
Finite-Lived Intangible Asset, Expected Amortization, Year Three | 1,200 |  |  |
Finite-Lived Intangible Asset, Expected Amortization, Year Four | 1,200 |  |  |
Franchise Rights [Member] |  |  |  |
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill) | 0 |  |  |
Vehicles [Member] |  |  |  |
Depreciation, Total | 116,100 | $ 119,900 | $ 120,100 |
Finance Lease, Right-of-Use Asset, after Accumulated Amortization, Total | 108,500 |  |  |
Finance Lease, Right-of-Use Asset, Accumulated Amortization | $ 43,500 |  |  |

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