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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