RETIREMENT PLANS (Tables)

3 Months Ended

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