Document And Entity Information - USD ($)	12 Months Ended
	Oct. 31, 2021	Jan. 04, 2022	Apr. 30, 2021
Document Information [Line Items]
Entity Central Index Key	0000740664
Entity Registrant Name	R F INDUSTRIES LTD
Amendment Flag	false
Current Fiscal Year End Date	--10-31
Document Fiscal Period Focus	FY
Document Fiscal Year Focus	2021
Document Type	10-K
Document Annual Report	true
Document Period End Date	Oct. 31, 2021
Document Transition Report	false
Entity File Number	0-13301
Entity Incorporation, State or Country Code	NV
Entity Tax Identification Number	88-0168936
Entity Address, Address Line One	7610 Miramar Road, Bldg. 6000
Entity Address, City or Town	San Diego
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	92126-4202
City Area Code	858
Local Phone Number	549-6340
Title of 12(b) Security	Common Stock, $0.01 par value per share
Trading Symbol	RFIL
Security Exchange Name	NASDAQ
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Public Float			$ 56,700,000
Entity Common Stock, Shares Outstanding		10,058,571