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Note 2 - Significant Accounting Policies (Details Textual) - USD ($) $ in Millions |  |  | 12 Months Ended |
--- | --- | --- | --- | ---
May 02, 2022 | Jan. 03, 2022 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Feb. 25, 2019
Interest Costs Capitalized |  |  | $ 0.7 |  |  |
Depreciation |  |  | 194.1 | $ 177.1 | $ 148.3 |
Amortization |  |  | 27.0 | 22.1 | 21.2 |
Indefinite-Lived Franchise Rights |  |  | 12.3 | 12.3 |  |
Advertising Expense |  |  | 10.0 | 8.7 | 7.5 |
Capitalized Computer Software, Net |  |  | 3.0 | 4.2 |  |
Capitalized Computer Software, Accumulated Amortization |  |  | 16.0 | 14.9 |  |
RTC Canada [Member] |  |  |  |  |  |
Business Acquisition, Percentage of Voting Interests Acquired | 30.00% |  |  |  |  |
Business Combination, Consideration Transferred | $ 20.0 |  |  |  |  |
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 |  | $ 27.5 |  |  |  |
Acquisition of Equity Method Investments, Realized Gain (Loss) |  | $ 12.5 |  |  |  |
Vehicles [Member] |  |  |  |  |  |
Depreciation |  |  | 161.3 | $ 143.5 | $ 116.1 |
Finance Lease, Right-of-Use Asset, after Accumulated Amortization |  |  | 125.7 |  |  |
Finance Lease, Right-of-Use Asset, Accumulated Amortization |  |  | $ 58.9 |  |  |

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