RETIREMENT PLANS (Tables)

12 Months Ended

Sep. 30, 2019

Retirement Benefits [Abstract]

Schedule of changes in benefit obligations, fair values of plan assets and reconciliations of the funded status of the retirement plans

The following tables detail the changes in benefit obligations, fair values of plan assets and reconciliations of the funded status of the retirement plans:

	Pension						SERP						Postretirement Medical
	September 30,
	2019			2018			2019			2018			2019			2018
Change in Projected Benefit Obligation:
Benefit obligation at beginning of year	$	9,164,000		$	9,633,000		$	2,039,000		$	1,605,000		$	2,382,000		$	2,029,000
Service cost	189,000			216,000			32,000			39,000			—			—
Interest cost	372,000			355,000			78,000			76,000			99,000			76,000
Actuarial loss (gain)	1,426,000			(576,000		)	236,000			323,000			161,000			290,000
Benefits paid	(180,000		)	(464,000		)	—			(4,000		)	(9,000		)	(13,000		)
Benefit obligation at end of year	10,971,000			9,164,000			2,385,000			2,039,000			2,633,000			2,382,000
Change in Plan Assets:
Fair value of plan assets at beginning of year	10,012,000			9,098,000			—			—			—			—
Actual return on plan assets	245,000			1,178,000			—			—			—			—
Employer contributions	115,000			200,000			—			4,000			9,000			13,000
Benefits paid	(180,000		)	(464,000		)	—			(4,000		)	(9,000		)	(13,000		)
Fair value of plan assets at end of year	10,192,000			10,012,000			—			—			—			—
Funded status	$	(779,000	)	$	848,000		$	(2,385,000	)	$	(2,039,000	)	$	(2,633,000	)	$	(2,382,000	)

Schedule of amounts recognized in the consolidated balance sheets

	Pension					SERP						Postretirement Medical
	September 30,
	2019			2018		2019			2018			2019			2018
Amounts recognized in the Consolidated Balance Sheets:
Noncurrent assets	$	—		$	848,000	$	—		$	—		$	—		$	—
Current liabilities	—			—		(2,000		)	(4,000		)	(10,000		)	(7,000		)
Noncurrent liabilities	(779,000		)	—		(2,383,000		)	(2,035,000		)	(2,623,000		)	(2,375,000		)
Net amount	$	(779,000	)	$	848,000	$	(2,385,000	)	$	(2,039,000	)	$	(2,633,000	)	$	(2,382,000	)
Amounts recognized in accumulated other comprehensive loss (income) before income taxes:
Net actuarial loss	$	2,939,000		$	1,112,000	$	497,000		$	260,000		$	667,000		$	560,000
Prior service cost (credit)	54,000			59,000		(54,000		)	(59,000		)	—			—
Accumulated other comprehensive loss	$	2,993,000		$	1,171,000	$	443,000		$	201,000		$	667,000		$	560,000

Schedule of amounts recognized in accumulated other comprehensive (loss) income

	Pension					SERP						Postretirement Medical
	September 30,
	2019			2018		2019			2018			2019			2018
Amounts recognized in the Consolidated Balance Sheets:
Noncurrent assets	$	—		$	848,000	$	—		$	—		$	—		$	—
Current liabilities	—			—		(2,000		)	(4,000		)	(10,000		)	(7,000		)
Noncurrent liabilities	(779,000		)	—		(2,383,000		)	(2,035,000		)	(2,623,000		)	(2,375,000		)
Net amount	$	(779,000	)	$	848,000	$	(2,385,000	)	$	(2,039,000	)	$	(2,633,000	)	$	(2,382,000	)
Amounts recognized in accumulated other comprehensive loss (income) before income taxes:
Net actuarial loss	$	2,939,000		$	1,112,000	$	497,000		$	260,000		$	667,000		$	560,000
Prior service cost (credit)	54,000			59,000		(54,000		)	(59,000		)	—			—
Accumulated other comprehensive loss	$	2,993,000		$	1,171,000	$	443,000		$	201,000		$	667,000		$	560,000

Schedule of weighted-average assumptions used to determine benefit obligations and net periodic benefit costs

The following table presents the weighted-average assumptions used to determine benefit obligations and net benefit (income) costs:

	Pension		SERP		Postretirement Medical
	Year ended September 30,
	2019	2018	2019	2018	2019	2018
Assumptions used to determine fiscal year-end benefit obligations:
Discount rate	3.06%	4.15%	3.06%	4.15%	3.06%	4.15%
Rate of compensation increase	4.00%	4.00%	4.00%	4.00%	N/A	N/A
Assumptions used to determine net benefit costs (years ended):
Discount rate	4.15%	3.75%	4.15%	3.75%	4.15%	3.75%
Expected return on plan assets	6.50%	6.50%	N/A	N/A	N/A	N/A
Rate of compensation increase	4.00%	4.00%	4.00%	4.00%	N/A	N/A

Schedule of components of net periodic benefit cost

The components of net periodic benefit (income) cost are as follows:

	Pension						SERP						Postretirement Medical
	Year ended September 30,
	2019			2018			2019			2018			2019		2018
Net periodic benefit (income) cost for the year:
Service cost	$	189,000		$	216,000		$	32,000		$	39,000		$	—	$	—
Interest cost	372,000			355,000			78,000			76,000			99,000		76,000
Expected return on plan assets	(648,000		)	(591,000		)	—			—			—		—
Amortization of prior service cost (credit)	6,000			6,000			(6,000		)	(6,000		)	—		—
Amortization of net actuarial loss	2,000			99,000			—			14,000			53,000		11,000
Net periodic benefit (income) cost	$	(79,000	)	$	85,000		$	104,000		$	123,000		$	152,000	$	87,000

Schedule of amounts that are estimated to be amortized from accumulated other comprehensive loss into net periodic benefit cost in the next fiscal year

The amounts that are estimated to be amortized from accumulated other comprehensive loss into net periodic benefit (income) cost in the next fiscal year are as follows:

	Pension		SERP			Postretirement Medical
Prior service cost (credit)	$	5,000	$	(5,000	)	$	—
Net actuarial loss	139,000		19,000			81,000
	$	144,000	$	14,000		$	81,000

Schedule of benefits expected to be paid under the retirement plans

The benefits expected to be paid under the retirement plans as of September 30, 2019 are as follows:

	Pension		SERP		Postretirement Medical
Expected Benefit Payments:
Fiscal year ending September 30, 2020	$	369,000	$	2,000	$	10,000
Fiscal year ending September 30, 2021	$	378,000	$	66,000	$	37,000
Fiscal year ending September 30, 2022	$	372,000	$	66,000	$	32,000
Fiscal year ending September 30, 2023	$	443,000	$	98,000	$	34,000
Fiscal year ending September 30, 2024	$	513,000	$	130,000	$	52,000
Fiscal years ending September 30, 2025 through 2029	$	2,675,000	$	683,000	$	378,000

Schedule of assumed health care cost trend rates related to the measurement of postretirement medical obligations

The following table provides the assumed health care cost trend rates related to the measurement of Barnwell’s postretirement medical obligations.

	Year ended September 30,
	2019	2018
Health care cost trend rates assumed for next year	7.00%	7.25%
Ultimate cost trend rate	5.00%	5.00%
Year that the rate reaches the ultimate trend rate	2028	2028

Schedule of effects of one-percentage-point change in the assumed health care cost trend rates

A one-percentage-point change in the assumed health care cost trend rates would have the following effects:

	1-Percentage Point Increase		1-Percentage Point (Decrease)
Effect on total service and interest cost components	$	22,000	$	(18,000	)
Effect on accumulated postretirement benefit obligations	$	586,000	$	(458,000	)

Schedule of year-end target allocation, by asset category, and the actual asset allocations

The Company’s year-end target allocation, by asset category, and the actual asset allocations were as follows:

	Target	September 30,
Asset Category	Allocation	2019	2018
Cash and other	0% - 25%	—%	2%
Fixed income securities	15% - 40%	38%	24%
Equity securities	45% - 75%	62%	74%

Schedule of pension plan assets at fair value

The following tables set forth by level, within the fair value hierarchy, pension plan assets at their fair value:

			Fair Value Measurements Using:
	Carrying Amount as of September 30, 2019		Quoted Prices in Active Markets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Financial Assets:
Cash	$	4,000	$	4,000	$	—	$	—
Corporate bonds	1,000		1,000		—		—
Fixed income exchange-traded funds	3,859,000		3,859,000		—		—
Equity securities exchange-traded funds	547,000		547,000		—		—
Equities	5,781,000		5,781,000		—		—
Total	$	10,192,000	$	10,192,000	$	—	$	—
			Fair Value Measurements Using:
	Carrying Amount as of September 30, 2018		Quoted Prices in Active Markets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Financial Assets:
Cash	$	221,000	$	221,000	$	—	$	—
Certificates of deposit	230,000		230,000		—		—
Corporate bonds	3,000		3,000		—		—
Fixed income exchange-traded funds	2,135,000		2,135,000		—		—
Equity securities exchange-traded funds	567,000		567,000		—		—
Equities	6,856,000		6,856,000		—		—
Total	$	10,012,000	$	10,012,000	$	—	$	—