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RETIREMENT PLANS (Tables) | 3 Months Ended
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Dec. 31, 2021
Retirement Benefits [Abstract] |
Schedule of components of net periodic benefit cost (income) | The following table details the components of net periodic benefit (income) cost for Barnwell’s retirement plans:
| Pension Plan |  | SERP |  | Postretirement Medical
| Three months ended December 31,
| 2021 |  | 2020 |  | 2021 |  | 2020 |  | 2021 |  | 2020
Interest cost | $ | 73,000 |  |  | $ | 65,000 |  |  | $ | 15,000 |  |  | $ | 13,000 |  |  | $ | — |  |  | $ | 18,000 |
Expected return on plan assets | (156,000) |  |  | (137,000) |  |  | — |  |  | — |  |  | — |  |  | — |
Amortization of net actuarial loss | — |  |  | 10,000 |  |  | — |  |  | — |  |  | — |  |  | 23,000 |
Net periodic benefit (income) cost | $ | (83,000) |  |  | $ | (62,000) |  |  | $ | 15,000 |  |  | $ | 13,000 |  |  | $ | — |  |  | $ | 41,000 |

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- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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