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Document And Entity Information
Nov. 01, 2019
Document Information [Line Items]  
Entity Registrant Name Rush Enterprises, Inc.
Document Type 8-K
Document Period End Date Nov. 01, 2019
Entity Incorporation, State or Country Code TX
Entity File Number 0-20797
Entity Tax Identification Number 74-1733016
Entity Address, Address Line One 555 IH-35 South
Entity Address, City or Town New Braunfels
Entity Address, State or Province TX
Entity Address, Postal Zip Code 78130
City Area Code 830
Local Phone Number 302-5200
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Entity Emerging Growth Company false
Amendment Flag false
Entity Central Index Key 0001012019
ClassACommonStock001ParValue Custom [Member]  
Document Information [Line Items]  
Title of 12(b) Security Class A Common Stock, $0.01 par value
Trading Symbol RUSHA
Security Exchange Name NASDAQ
ClassBCommonStock001ParValue Custom [Member]  
Document Information [Line Items]  
Title of 12(b) Security Class B Common Stock, $0.01 par value
Trading Symbol RUSHB
Security Exchange Name NASDAQ