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Note 2 - Significant Accounting Policies (Details Textual) - USD ($) $ in Thousands |  |  | 12 Months Ended |
--- | --- | --- | --- | ---
May 02, 2022 | Jan. 03, 2022 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Feb. 25, 2019
Depreciation |  |  | $ 207,300 | $ 194,100 | $ 177,100 |
Amortization |  |  | 28,800 | 27,000 | 22,100 |
Indefinite-Lived Franchise Rights |  |  | 12,000 | 12,000 |  |
Goodwill and Intangible Asset Impairment |  |  | 0 | 0 | 0 |
Advertising Expense |  |  | 11,300 | 10,000 | 8,700 |
Capitalized Computer Software, Net |  |  | 1,800 | 3,000 |  |
Capitalized Computer Software, Accumulated Amortization |  |  | 17,200 | 16,000 |  |
RTC Canada [Member] |  |  |  |  |  |
Business Acquisition, Percentage of Voting Interests Acquired | 30.00% |  |  |  |  |
Business Combination, Consideration Transferred | $ 20,000 |  |  |  |  |
RTC Canada [Member] | RTC Canada [Member] |  |  |  |  |  |
Subsidiary, Ownership Percentage, Noncontrolling Owner | 20.00% |  |  |  |  |
Rush Truck Centres of Canada Limited [Member] |  |  |  |  |  |
Equity Method Investment, Ownership Percentage |  |  |  |  |  | 50.00%
Momentum Fuel Technologies [Member] |  |  |  |  |  |
Equity Method Investment, Ownership Percentage |  | 50.00% |  |  |  |
Payments to Acquire Equity Method Investments |  | $ 27,500 |  |  |  |
Acquisition of Equity Method Investments, Realized Gain (Loss) |  | $ 12,500 |  |  |  |
Vehicles [Member] |  |  |  |  |  |
Depreciation |  |  | 167,600 | $ 161,300 | $ 143,500 |
Finance Lease, Right-of-Use Asset, after Accumulated Amortization |  |  | 122,400 |  |  |
Finance Lease, Right-of-Use Asset, Accumulated Amortization |  |  | $ 66,900 |  |  |

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