RETIREMENT PLANS (Tables)

3 Months Ended

Dec. 31, 2016

Compensation and Retirement Disclosure [Abstract]

Schedule of components of net periodic benefit cost

The following table details the components of net periodic benefit cost for Barnwell’s retirement plans:

	Pension Plan						SERP						Postretirement Medical
	Three months ended December 31,
	2016			2015			2016			2015			2016		2015
Service cost	$	72,000		$	65,000		$	16,000		$	16,000		$	—	$	—
Interest cost	87,000			91,000			21,000			20,000			22,000		14,000
Expected return on plan assets	(141,000		)	(112,000		)	—			—			—		—
Amortization of prior service cost (credit)	1,000			1,000			(1,000		)	(1,000		)	—		—
Amortization of net actuarial loss	41,000			34,000			9,000			5,000			47,000		—
Net periodic benefit cost	$	60,000		$	79,000		$	45,000		$	40,000		$	69,000	$	14,000