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Note 11 - Share Based Compensation and Employee Benefit Plans (Details Textual) - USD ($) | 12 Months Ended | 24 Months Ended |
--- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2019 | May 16, 2017
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross | 482,663 |  |  |  |
Share-based Payment Arrangement, Expense | $ 19,000,000.0 | $ 18,100,000 | $ 15,600,000 |  |
Proceeds from Stock Options Exercised | 11,100,000 | 5,700,000 | 24,800,000 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value | 8,700,000 | 2,700,000 | 25,000,000.0 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value | $ 5,000,000.0 | $ 5,700,000 | $ 6,300,000 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value | $ 12.56 | $ 15.46 | $ 12.33 |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total | $ 8,400,000 |  |  | $ 8,400,000 |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition | 2 years 2 months 12 days |  |  |  |
Deferred Compensation Plan [Member] |  |  |  |  |
Deferred Compensation Arrangement with Individual, Vested Percentage | 100.00% |  |  |  |
Deferred Compensation Liability, Current, Total | $ 15,600,000 | $ 11,100,000 |  | 15,600,000 |
Cash Surrender Value of Life Insurance | $ 10,600,000 | 8,900,000 |  | 10,600,000 |
Rush 401 Plan [Member] |  |  |  |  |
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay | 10.00% |  |  |  |
Defined Contribution Plan, Cost | $ 9,400,000 | $ 8,900,000 | $ 7,000,000.0 |  |
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 | $ 9,000,000.0 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value | $ 40.36 | $ 40.46 | $ 31.37 |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total | $ 8,300,000 |  |  | $ 8,300,000 |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition | 1 year 3 months 18 days |  |  |  |
Common Class A [Member] |  |  |  |  |
Share Price | $ 46.50 |  |  | $ 46.50 |
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 |  |  | $ 25,000 |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant | 213,600 |  |  | 213,600 |
Common Stock, Capital Shares Reserved for Future Issuance | 1,400,000 |  |  | 1,400,000 |
Stock Issued During Period, Shares, Employee Stock Purchase Plans | 117,283 | 84,192 |  |  |
Number of Employees Eligible to Participate in Stock Purchase Plan | 7,244 |  |  |  |
Number of Employees Participating in Stock Purchase Plan | 1,637 |  |  |  |
The 2006 Non-Employee Director Stock Option Plan [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized | 500,000 |  |  | 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 | 126,000 |  |  | 126,000 |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized | 500,000 |  |  | 500,000 |
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture, Total | 14,375 | 11,412 |  |  |
The 2006 Non-Employee Director Stock Option Plan [Member] | Common Class A [Member] | Shares Issued to Three Non-employee Directors [Member] |  |  |  |  |
Share-based Goods and Nonemployee Services Transaction, Quantity of Securities Issued | 3,171 |  |  |  |
The 2006 Non-Employee Director Stock Option Plan [Member] | Common Class A [Member] | Shares Issued to Two Nonemployee Directors [Member] |  |  |  |  |
Issuance of Stock and Cash for Non-employee Director Compensation |  | $ 125,000 |  |  |
Share-based Goods and Nonemployee Services Transaction, Quantity of Securities Issued | 1,903 | 2,926 |  |  |
Payment to Nonemployee Directors | $ 50,000 |  |  |  |
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 | $ 62,500 |  |  |  |
Share-based Goods and Nonemployee Services Transaction, Quantity of Securities Issued | 1,056 | 2,048 |  |  |
Payment to Nonemployee Directors | $ 18,750 | $ 37,500 |  |  |
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 |  |  |
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 | 1,316,000 |  |  | 1,316,000 |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized | 7,800,000 |  |  | 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 | 482,663 | 459,663 |  |  |
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 | 444,000 |  |  | 444,000 |
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, Maximum Number of Shares Per Employee |  |  |  | 100,000 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross | 317,590 |  |  |  |
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 | 2,200,000 |  |  | 2,200,000 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross |  | 306,590 |  |  |
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 -Publisher FASB -Name Accounting Standards Codification -Topic 710 -SubTopic 10 -Section 25 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=6409733&loc=d3e19512-108361 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 710 -SubTopic 10 -Section 30 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6409875&loc=d3e20028-108363 + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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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=116856206&loc=d3e5070-113901 + Details
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