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Document and Entity Information - USD ($)
Sep. 30, 2020
Dec. 09, 2020
Mar. 31, 2020
Cover [Abstract]      
Document Type 10-K/A    
Amendment Flag true    
Amendment Description Amendment No. 1    
Document Period End Date Sep. 30, 2020    
Current Fiscal Year End Date --09-30    
Document Transition Report false    
Entity Registrant Name BARNWELL INDUSTRIES, INC.    
Entity Incorporation, State or Country Code DE    
Entity File Number 001-05103    
Entity Tax Identification Number 72-0496921    
Entity Address, Address Line One 1100 Alakea Street    
Entity Address, Address Line Two Suite 2900    
Entity Address, City or Town Honolulu    
Entity Address, State or Province HI    
Entity Address, Postal Zip Code 96813-2840    
City Area Code 808    
Local Phone Number 531-8400    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Filer Category Non-accelerated Filer    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Emerging Growth Company false    
Entity Shell Company false    
Entity Small Business true    
Entity Public Float     $ 1,990,000
Entity Common Stock, Shares Outstanding   8,277,160  
Document Fiscal Year Focus 2020    
Document Fiscal Period Focus FY    
Entity Central Index Key 0000010048    
Document Annual Report true    
Title of 12(b) Security Common Stock, $0.50 par value    
Trading Symbol BRN    
Security Exchange Name NYSEAMER