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Note 11 - Share Based Compensation and Employee Benefit Plans (Details Textual) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | May 16, 2017
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross | 459,663 |  |  |
Allocated Share-based Compensation Expense, Total | $ 18,100,000 | $ 15,600,000 | $ 12,900,000 |
Proceeds from Stock Options Exercised | 5,700,000 | 24,800,000 | 6,500,000 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value | 2,700,000 | 25,000,000 | 4,800,000 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value | $ 5,700,000 | $ 6,300,000 | $ 5,600,000 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value | $ 15.46 | $ 12.33 | $ 6.54 |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Total | $ 8,100,000 |  |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition | 3 years 109 days |  |  |
Deferred Compensation Plan [Member] |  |  |  |
Deferred Compensation Arrangement with Individual, Vested Percentage | 100.00% |  |  |
Deferred Compensation Liability, Current, Total | $ 11,100,000 | $ 9,800,000 |  |
Cash Surrender Value of Life Insurance | $ 8,900,000 | 9,600,000 |  |
Rush 401 Plan [Member] |  |  |  |
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay | 10.00% |  |  |
Defined Contribution Plan, Cost | $ 8,900,000 | $ 7,000,000 | $ 6,500,000 |
Rush 401 Plan [Member] | Highly Compensated Employees [Member] |  |  |  |
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent | 15.00% |  |  |
Rush 401 Plan [Member] | Employees with Less than Five Years of Service [Member] |  |  |  |
Defined Contribution Plan, Employer Matching Contribution, Percent of Match | 20.00% |  |  |
Rush 401 Plan [Member] | Employees with More Than Five Years of Service [Member] |  |  |  |
Defined Contribution Plan, Employer Matching Contribution, Percent of Match | 40.00% |  |  |
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, Equity Instruments Other than Options, Vested in Period, Fair Value | $ 6,600,000 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value | $ 40.46 | $ 31.37 | $ 17.57 |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Total | $ 7,100,000 |  |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition | 1 year 328 days |  |  |
Common Class A [Member] |  |  |  |
Share Price | $ 34.48 |  |  |
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 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant | 331,000 |  |  |
Common Stock, Capital Shares Reserved for Future Issuance | 1,400,000 |  |  |
Stock Issued During Period, Shares, Employee Stock Purchase Plans | 84,192 | 112,754 |  |
Number of Employees Eligible to Participate in Stock Purchase Plan | 7,214 |  |  |
Number of Employees Participating in Stock Purchase Plan | 1,495 |  |  |
The 2006 Non-Employee Director Stock Option Plan [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized | 500,000 |  |  |
Issuance of Cash for Non-employee Director Compensation, Percent | 40.00% |  |  |
Issuance of Stock and Cash for Non-employee Director Compensation | $ 125,000 |  |  |
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 | 140,300 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized | 500,000 |  |  |
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures, Total | 11,412 | 13,393 |  |
The 2006 Non-Employee Director Stock Option Plan [Member] | Common Class A [Member] | Shares Issued to Two Nonemployee Directors [Member] |  |  |  |
Share-based Goods and Nonemployee Services Transaction, Quantity of Securities Issued | 2,926 | 3,307 |  |
The 2006 Non-Employee Director Stock Option Plan [Member] | Common Class A [Member] | Shares Issued to One Nonemployee Director [Member] |  |  |  |
Issuance of Stock and Cash for Non-employee Director Compensation |  | $ 125,000 |  |
Share-based Goods and Nonemployee Services Transaction, Quantity of Securities Issued | 2,048 | 1,984 |  |
Payment to Nonemployee Directors | $ 37,500 | $ 50,000 |  |
The 2006 Non-Employee Director Stock Option Plan [Member] | Common Class A [Member] | Shares Issued to Two Nonemployee Directors 2 [Member] |  |  |  |
Issuance of Stock and Cash for Non-employee Director Compensation | $ 125,000 |  |  |
Share-based Goods and Nonemployee Services Transaction, Quantity of Securities Issued | 1,756 |  |  |
Payment to Nonemployee Directors | $ 50,000 |  |  |
The 2006 Non-Employee Director Stock Option Plan [Member] | Common Class A [Member] | Shares Issued to One Non-Employee Director 2 [Member] |  |  |  |
Share-based Goods and Nonemployee Services Transaction, Quantity of Securities Issued |  | 2,315 |  |
Payment to Nonemployee Directors |  | $ 37,500 |  |
The 2006 Non-Employee Director Stock Option Plan [Member] | Common Class A [Member] | Shares Issued to One Non-Employee Director 3 [Member] |  |  |  |
Share-based Goods and Nonemployee Services Transaction, Quantity of Securities Issued |  | 2,480 |  |
Payment to Nonemployee Directors |  | $ 31,250 |  |
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] | Restricted Stock Units (RSUs) [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period | 3 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 | 1,781,000 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized | 7,800,000 |  |  | 7,800,000
Share-based Compensation Arrangement by Share-based Payment Award, Maximum Number of Shares Per Employee | 100,000 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross | 459,663 | 472,463 |  |
Amended and Restated 2007 Incentive Plan [Member] | Common Class B [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized |  |  |  | 2,200,000
Share-based Compensation Arrangement by Share-based Payment Award, Maximum Number of Shares Per Employee | 100,000 |  |  |
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 Available for Grant | 762,000 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized | 2,200,000 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross | 306,590 | 274,390 |  |
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 The highest quantity of shares an employee can purchase under the plan per period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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