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Note 11 - Share Based Compensation and Employee Benefit Plans (Details Textual) - USD ($) | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Oct. 31, 2024 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | May 16, 2023
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross |  | 538,700 |  |  |
Share-Based Payment Arrangement, Expense |  | $ 30,400,000 | $ 30,400,000 | $ 25,300,000 |
Proceeds from Stock Options Exercised |  | 25,400,000 | 18,000,000 | 13,300,000 |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period, Intrinsic Value |  | 47,300,000 | 19,800,000 | 11,600,000 |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested in Period, Fair Value |  | $ 5,800,000 | $ 5,800,000 | $ 5,900,000 |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value |  | $ 17.13 | $ 11.82 | $ 11.21 |
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount |  | $ 12,400,000 |  |  |
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition |  | 2 years 1 month 6 days |  |  |
Deferred Compensation Plan [Member] |  |  |  |  |
Deferred Compensation Arrangement with Individual, Vested Percentage |  | 100.00% |  |  |
Deferred Compensation Liability, Current |  | $ 28,100,000 | $ 24,800,000 |  |
Cash Surrender Value of Life Insurance |  | $ 24,400,000 | 18,000,000 |  |
Rush 401 Plan [Member] |  |  |  |  |
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay |  | 10.00% |  |  |
Defined Contribution Plan, Cost |  | $ 14,000,000 | $ 13,300,000 | $ 12,100,000 |
Rush 401 Plan [Member] | Minimum [Member] |  |  |  |  |
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent |  | 1.00% |  |  |
Rush 401 Plan [Member] | Maximum [Member] |  |  |  |  |
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent |  | 50.00% |  |  |
Restricted Stock Units (RSUs) [Member] |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period |  | 3 years |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value |  | $ 9,200,000 |  |  |
Granted, weighted average grant date fair value (in dollars per share) |  | $ 50.64 | $ 36.97 | $ 33.33 |
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount |  | $ 13,500,000 |  |  |
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition |  | 1 year 3 months 18 days |  |  |
Highly Compensated Employees [Member] | Rush 401 Plan [Member] |  |  |  |  |
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent |  | 15.00% |  |  |
Employees with Less than Five Years of Service [Member] | Rush 401 Plan [Member] |  |  |  |  |
Defined Contribution Plan, Employer Matching Contribution, Percent of Match |  | 20.00% |  |  |
Employees with More Than Five Years of Service [Member] | Rush 401 Plan [Member] |  |  |  |  |
Defined Contribution Plan, Employer Matching Contribution, Percent of Match |  | 40.00% |  |  |
Common Class A [Member] |  |  |  |  |
Share Price |  | $ 54.79 |  |  |
Employee Stock Purchase Plan [Member] |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Purchase Price of Common Stock, Percent |  | 85.00% |  |  |
Maximum Fair Value for Employee Stock Purchase Per Year |  | $ 25,000 |  |  |
Stock Issued During Period, Shares, Employee Stock Purchase Plans |  | 195,540 | 208,854 |  |
Number of Employees Eligible to Participate in Stock Purchase Plan |  | 7,391 |  |  |
Number of Employees Participating in Stock Purchase Plan |  | 2,262 |  |  |
Employee Stock Purchase Plan [Member] | Common Class A [Member] |  |  |  |  |
Employee Stock Ownership Plan (ESOP), Number of Allocated Shares |  |  |  |  | 600,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant |  | 886,509 |  |  |
Common Stock, Capital Shares Reserved for Future Issuance |  | 4,650,000 |  |  |
The 2006 Non-Employee Director Stock Option Plan [Member] |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized |  | 1,125,000 |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Grant Date Aggregate Intrinsic Value |  | $ 145,000 |  |  |
Issuance of Cash for Non-employee Director Compensation, Percent |  | 40.00% |  |  |
The 2006 Non-Employee Director Stock Option Plan [Member] | Common Class A [Member] |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant |  | 162,533 |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized |  | 1,125,000 |  |  |
Shares Issued, Shares, Share-Based Payment Arrangement, after Forfeiture |  | 17,765 | 21,667 |  |
The 2006 Non-Employee Director Stock Option Plan [Member] | Common Class A [Member] | Shares Issued to One Nonemployee Director [Member] |  |  |  |  |
Stock Issued During Period, Shares, New Issues | 1,501 |  |  |  |
Stock Issued During Period, Value, New Issues | $ 72,500 |  |  |  |
The 2006 Non-Employee Director Stock Option Plan [Member] | Common Class A [Member] | Shares Issued to Three Non-employee Directors [Member] |  |  |  |  |
Stock Issued During Period, Shares, New Issues |  | 3,230 | 4,116 |  |
Issuance of Stock and Cash for Non-employee Director Compensation |  | $ 145,000 |  |  |
The 2006 Non-Employee Director Stock Option Plan [Member] | Common Class A [Member] | Shares Issued to Two Nonemployee Directors [Member] |  |  |  |  |
Stock Issued During Period, Shares, New Issues |  | 1,938 | 2,469 |  |
Payment to Nonemployee Directors |  | $ 58,000 | $ 58,000 |  |
The 2006 Non-Employee Director Stock Option Plan [Member] | Common Class A [Member] | Shares Issued to One Nonemployee Director [Member] |  |  |  |  |
Stock Issued During Period, Shares, New Issues |  | 2,261 | 2,880 |  |
Payment to Nonemployee Directors |  | $ 43,499 | $ 43,500 |  |
Stock Issued During Period, Value, New Issues |  |  | $ 145,000 |  |
Amended and Restated 2007 Incentive Plan [Member] |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period |  | 10 years |  |  |
Amended and Restated 2007 Incentive Plan [Member] | Common Class A [Member] |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant |  | 3,189,695 |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized |  | 21,600,000 |  |  | 21,600,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Maximum Number of Shares Per Employee |  | 150,000 |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross |  | 538,700 | 790,673 |  |
Amended and Restated 2007 Incentive Plan [Member] | Common Class B [Member] |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant |  | 2,283,175 |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized |  |  |  |  | 9,000,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Maximum Number of Shares Per Employee |  | 150,000 |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross |  | 398,525 | 551,138 |  |
Amended and Restated 2007 Incentive Plan [Member] | Common Class B [Member] | Restricted Stock Units (RSUs) [Member] |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized |  | 9,000,000 |  |  |
Every 6 Months [Member] | Employee Stock Purchase Plan [Member] |  |  |  |  |
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Amount |  | $ 10,625 |  |  |

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- Definition Aggregate carrying value as of the balance sheet date of the liabilities for all deferred compensation arrangements payable within one year (or the operating cycle, if longer). Represents currently earned compensation under compensation arrangements that is not actually paid until a later date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 710 -SubTopic 10 -Name Accounting Standards Codification -Section 25 -Paragraph 9 -Publisher FASB -URI https://asc.fasb.org/1943274/2147483070/710-10-25-9 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 710 -SubTopic 10 -Section 30 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147483043/710-10-30-2 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(01) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Gross number of share options (or share units) granted during the period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(01) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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