XML 13 R1.htm IDEA: XBRL DOCUMENT v3.19.2
Document And Entity Information - shares
 6 Months Ended
Jun. 30, 2019
Jul. 31, 2019
Document Information [Line Items]    
Entity Central Index Key 0001012019  
Entity Shell Company false  
Entity Registrant Name RUSH ENTERPRISES INC \TX\  
Amendment Flag false  
Current Fiscal Year End Date --12-31  
Document Fiscal Period Focus Q2  
Document Fiscal Year Focus 2019  
Entity Small Business false  
Entity Emerging Growth Company false  
Document Quarterly Report true  
Document Transition Report false  
Document Type 10-Q  
Document Period End Date Jun. 30, 2019  
Entity File Number 0-20797  
Entity Incorporation, State or Country Code TX  
Entity Tax Identification Number 74-1733016  
Entity Address, Address Line One 555 I.H. 35 South, Suite 500  
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  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Large Accelerated Filer  
Common Class B [Member]    
Document Information [Line Items]    
Entity Common Stock, Shares Outstanding   8,341,564
Title of 12(b) Security Class B Common Stock  
Trading Symbol RUSHB  
Security Exchange Name NASDAQ  
Common Class A [Member]    
Document Information [Line Items]    
Entity Common Stock, Shares Outstanding   27,993,723
Title of 12(b) Security Class A Common Stock  
Trading Symbol RUSHA  
Security Exchange Name NASDAQ