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Note 11 - Share Based Compensation and Employee Benefit Plans (Details Textual) - USD ($) | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | May. 20, 2014 | May. 18, 2010 | May. 16, 2006
Every 6 Months [Member] | Employee Stock Purchase Plan [Member] |  |  |  |  |  |
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Amount | $ 10,625 |  |  |  |  |
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 | 165,000 |  |  |  |  |
Common Stock, Capital Shares Reserved for Future Issuance | 900,000 |  |  |  |  |
Stock Issued During Period, Shares, Employee Stock Purchase Plans | 85,263 | 64,090 |  |  |  |
Number of Employees Eligible to Participate in Stock Purchase Plan | 6,700 |  |  |  |  |
Number of Employees Participating in Stock Purchase Plan | 1,034 |  |  |  |  |
The 2006 Non-Employee Director Stock Option Plan [Member] | Shares Issued to Four Non-employee Directors [Member] | Common Class A [Member] |  |  |  |  |  |
Share-based Goods and Nonemployee Services Transaction, Quantity of Securities Issued |  | 3,877 |  |  |  |
The 2006 Non-Employee Director Stock Option Plan [Member] | Shares Issued to Four Non-employee Directors [Member] |  |  |  |  |  |
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] | Shares Issued to One Nonemployee Director [Member] | Common Class A [Member] |  |  |  |  |  |
Issuance of Stock and Cash for Non-employee Director Compensation | $ 125,000 |  |  |  |  |
Share-based Goods and Nonemployee Services Transaction, Quantity of Securities Issued | 3,780 | 3,101 |  |  |  |
Payment to Nonemployee Directors | $ 25,000 |  |  |  |  |
The 2006 Non-Employee Director Stock Option Plan [Member] | Shares Issued to One Nonemployee Director [Member] |  |  |  |  |  |
Issuance of Stock and Cash for Non-employee Director Compensation |  | $ 125,000 |  |  |  |
Payment to Nonemployee Directors |  | $ 25,000 |  |  |  |
The 2006 Non-Employee Director Stock Option Plan [Member] | Shares Issued to One Non-Employee Director 2 [Member] | Common Class A [Member] |  |  |  |  |  |
Share-based Goods and Nonemployee Services Transaction, Quantity of Securities Issued |  | 2,326 |  |  |  |
The 2006 Non-Employee Director Stock Option Plan [Member] | Shares Issued to One Non-Employee Director 2 [Member] |  |  |  |  |  |
Issuance of Stock and Cash for Non-employee Director Compensation |  | $ 125,000 |  |  |  |
Payment to Nonemployee Directors |  | $ 50,000 |  |  |  |
The 2006 Non-Employee Director Stock Option Plan [Member] | Shares Issued to Three Non-employee Directors [Member] | Common Class A [Member] |  |  |  |  |  |
Share-based Goods and Nonemployee Services Transaction, Quantity of Securities Issued | 4,725 |  |  |  |  |
The 2006 Non-Employee Director Stock Option Plan [Member] | Shares Issued to Three Non-employee Directors 2 [Member] | Common Class A [Member] |  |  |  |  |  |
Issuance of Stock and Cash for Non-employee Director Compensation | $ 125,000 |  |  |  |  |
Share-based Goods and Nonemployee Services Transaction, Quantity of Securities Issued | 2,835 |  |  |  |  |
Payment to Nonemployee Directors | $ 50,000 |  |  |  |  |
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 | 192,000 |  |  |  |  |
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 | 26,460 | 20,935 |  |  |  |
The 2006 Non-Employee Director Stock Option Plan [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized |  |  |  |  |  | 1,500,000
Reduction in Number of Shares Reserved for Issuance |  |  |  |  | 1,000,000 |
Number of Shares Available for Purchase With Options by Nonemployee Director Each Year | 20,000 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period | 10 years |  |  |  |  |
Amended and Restated 2007 Incentive Plan [Member] | Common Class A [Member] | Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period |  | 25,550 |  |  |  |
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 | 1,335,000 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized |  |  |  | 6,050,000 |  |
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 | 485,838 | 459,058 |  |  |  |
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, Options, Grants in Period, Gross | 259,490 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period |  | 207,370 |  |  |  |
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 | 769,000 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized |  |  |  | 1,450,000 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Maximum Number of Shares Per Employee | 100,000 |  |  |  |  |
Amended and Restated 2007 Incentive Plan [Member] | 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] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period | 10 years |  |  |  |  |
Common Class A [Member] |  |  |  |  |  |
Share Price | $ 21.89 |  |  |  |  |
Restricted Stock [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period | 285,950 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value |  |  | $ 5,000,000 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value | $ 24.75 |  |  |  |  |
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% |  |  |  |  |
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] |  |  |  |  |  |
Contribution Plan Period for Eligibility | 90 days |  |  |  |  |
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay | 10.00% |  |  |  |  |
Defined Contribution Plan, Cost Recognized | $ 6,200,000 | $ 5,200,000 | 4,400,000 |  |  |
Deferred Compensation Plan [Member] |  |  |  |  |  |
Deferred Compensation Arrangement with Individual, Vested Percentage | 100.00% |  |  |  |  |
Deferred Compensation Liability, Current | $ 4,900,000 | 3,000,000 |  |  |  |
Cash Surrender Value of Life Insurance | $ 4,800,000 | 2,900,000 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross | 484,838 |  |  |  |  |
Allocated Share-based Compensation Expense | $ 12,400,000 | 11,300,000 | 8,600,000 |  |  |
Proceeds from Stock Options Exercised | 4,300,000 | 12,500,000 | 10,000,000 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value | 2,600,000 | 18,700,000 | 10,500,000 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value | $ 5,100,000 | $ 3,300,000 | $ 3,400,000 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value | $ 11.27 | $ 15.86 | $ 12.69 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value | $ 24.75 | $ 26.81 | $ 22.12 |  |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized | $ 16,400,000 |  |  |  |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition | 2 years 182 days |  |  |  |  |

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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- Definition Unrecognized cost of unvested share-based compensation awards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3255-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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- Definition The number of grants made 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/presentationRef -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=6415400&loc=d3e5070-113901 + 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/presentationRef -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=6415400&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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=6415400&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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + 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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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