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Document and Entity Information - USD ($)
$ in Millions
 12 Months Ended
Oct. 31, 2019
Dec. 13, 2019
Apr. 30, 2019
Document and Entity Information [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Oct. 31, 2019    
Document Fiscal Year Focus 2019    
Document Fiscal Period Focus FY    
Entity Registrant Name R F INDUSTRIES LTD    
Entity Central Index Key 0000740664    
Current Fiscal Year End Date --10-31    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Filer Category Non-accelerated Filer    
Entity Public Float     $ 47.1
Trading Symbol RFIL    
Entity Common Stock, Shares Outstanding   9,614,617  
Entity Shell Company false    
Entity Emerging Growth Company false    
Entity Small Business true