REVENUE FROM CONTRACTS WITH CUSTOMERS - DISAGGREGATION OF REVENUE (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Disaggregation of Revenue [Line Items]
Revenue before interest income	$ 3,178	$ 4,485	$ 10,651	$ 14,292
Oil
Disaggregation of Revenue [Line Items]
Revenue before interest income	2,360	3,597	8,104	10,474
Natural gas
Disaggregation of Revenue [Line Items]
Revenue before interest income	430	378	1,267	1,768
Natural gas liquids
Disaggregation of Revenue [Line Items]
Revenue before interest income	363	477	1,222	1,484
Contingent residual payments
Disaggregation of Revenue [Line Items]
Revenue before interest income				500
Other
Disaggregation of Revenue [Line Items]
Revenue before interest income	25	33	58	66
United States
Disaggregation of Revenue [Line Items]
Revenue before interest income	347	535	1,078	2,463
Canada
Disaggregation of Revenue [Line Items]
Revenue before interest income	2,831	3,950	9,573	11,829
Goods transferred at a point in time
Disaggregation of Revenue [Line Items]
Revenue before interest income	3,178	4,485	10,651	14,292
Oil and natural gas
Disaggregation of Revenue [Line Items]
Revenue before interest income	3,153	4,452	10,593	13,726
Oil and natural gas | Oil
Disaggregation of Revenue [Line Items]
Revenue before interest income	2,360	3,597	8,104	10,474
Oil and natural gas | Natural gas
Disaggregation of Revenue [Line Items]
Revenue before interest income	430	378	1,267	1,768
Oil and natural gas | Natural gas liquids
Disaggregation of Revenue [Line Items]
Revenue before interest income	363	477	1,222	1,484
Oil and natural gas | Contingent residual payments
Disaggregation of Revenue [Line Items]
Revenue before interest income				0
Oil and natural gas | Other
Disaggregation of Revenue [Line Items]
Revenue before interest income	0	0	0	0
Oil and natural gas | United States
Disaggregation of Revenue [Line Items]
Revenue before interest income	347	534	1,078	1,962
Oil and natural gas | Canada
Disaggregation of Revenue [Line Items]
Revenue before interest income	2,806	3,918	9,515	11,764
Oil and natural gas | Goods transferred at a point in time
Disaggregation of Revenue [Line Items]
Revenue before interest income	3,153	4,452	10,593	13,726
Land investment
Disaggregation of Revenue [Line Items]
Revenue before interest income	0	0	0	500
Land investment | Oil
Disaggregation of Revenue [Line Items]
Revenue before interest income	0	0	0	0
Land investment | Natural gas
Disaggregation of Revenue [Line Items]
Revenue before interest income	0	0	0	0
Land investment | Natural gas liquids
Disaggregation of Revenue [Line Items]
Revenue before interest income	0	0	0	0
Land investment | Contingent residual payments
Disaggregation of Revenue [Line Items]
Revenue before interest income				500
Land investment | Other
Disaggregation of Revenue [Line Items]
Revenue before interest income	0	0	0	0
Land investment | United States
Disaggregation of Revenue [Line Items]
Revenue before interest income	0	0	0	500
Land investment | Canada
Disaggregation of Revenue [Line Items]
Revenue before interest income	0	0	0	0
Land investment | Goods transferred at a point in time
Disaggregation of Revenue [Line Items]
Revenue before interest income	0	0	0	500
Other
Disaggregation of Revenue [Line Items]
Revenue before interest income	25	33	58	66
Other | Oil
Disaggregation of Revenue [Line Items]
Revenue before interest income	0	0	0	0
Other | Natural gas
Disaggregation of Revenue [Line Items]
Revenue before interest income	0	0	0	0
Other | Natural gas liquids
Disaggregation of Revenue [Line Items]
Revenue before interest income	0	0	0	0
Other | Contingent residual payments
Disaggregation of Revenue [Line Items]
Revenue before interest income				0
Other | Other
Disaggregation of Revenue [Line Items]
Revenue before interest income	25	33	58	66
Other | United States
Disaggregation of Revenue [Line Items]
Revenue before interest income	0	1	0	1
Other | Canada
Disaggregation of Revenue [Line Items]
Revenue before interest income	25	32	58	65
Other | Goods transferred at a point in time
Disaggregation of Revenue [Line Items]
Revenue before interest income	$ 25	$ 33	$ 58	$ 66