XML 41 R31.htm IDEA: XBRL DOCUMENT v3.25.0.1
RETIREMENT PLANS (Tables)
 3 Months Ended
Dec. 31, 2024
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 PlanSERP
 Three months ended December 31,
 2024202320242023
Interest cost$98,000 $103,000 $23,000 $24,000 
Expected return on plan assets(200,000)(192,000)— — 
Amortization of net actuarial gain — — — (21,000)
Net periodic benefit (income) cost$(102,000)$(89,000)$23,000 $3,000