Document and Entity Information
Document and Entity Information - USD ($) $ in Millions | 12 Months Ended | ||
Sep. 30, 2021 | Dec. 10, 2021 | Mar. 31, 2021 | |
Cover [Abstract] | |||
Document Type | 10-K/A | ||
Amendment Flag | false | ||
Document Period End Date | Sep. 30, 2021 | ||
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 | 1-5103 | ||
Entity Tax Identification Number | 72-0496921 | ||
Entity Address, Address Line One | 1100 Alakea St. | ||
Entity Address, Address Line Two | Suite 500 | ||
Entity Address, City or Town | Honolulu | ||
Entity Address, State or Province | HI | ||
Entity Address, Postal Zip Code | 96813 | ||
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 | $ 9,903,000 | ||
Entity Common Stock, Shares Outstanding | 9,445,625 | ||
Document Fiscal Year Focus | 2021 | ||
Document Fiscal Period Focus | FY | ||
Entity Central Index Key | 0000010048 | ||
Document Annual Report | true | ||
ICFR Auditor Attestation Flag | false | ||
Title of 12(b) Security | Common Stock, $0.50 par value | ||
Trading Symbol | BRN | ||
Security Exchange Name | NYSEAMER |