REVENUE FROM CONTRACTS WITH CUSTOMERS - DISAGGREGATION OF REVENUE (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Disaggregation of Revenue [Line Items]
Revenue before interest income	$ 3,367	$ 3,178	$ 8,595	$ 10,651
Oil
Disaggregation of Revenue [Line Items]
Revenue before interest income	2,574	2,360	6,260	8,104
Natural gas
Disaggregation of Revenue [Line Items]
Revenue before interest income	435	430	1,375	1,267
Natural gas liquids
Disaggregation of Revenue [Line Items]
Revenue before interest income	332	363	819	1,222
Other
Disaggregation of Revenue [Line Items]
Revenue before interest income	26	25	141	58
Contingent residual payments
Disaggregation of Revenue [Line Items]
Revenue before interest income				0
United States
Disaggregation of Revenue [Line Items]
Revenue before interest income	0	347	70	1,078
Canada
Disaggregation of Revenue [Line Items]
Revenue before interest income	3,367	2,831	8,525	9,573
Goods transferred at a point in time
Disaggregation of Revenue [Line Items]
Revenue before interest income	3,367	3,178	8,595	10,651
Oil and natural gas
Disaggregation of Revenue [Line Items]
Revenue before interest income	3,341	3,153	8,454	10,593
Oil and natural gas \| Oil
Disaggregation of Revenue [Line Items]
Revenue before interest income	2,574	2,360	6,260	8,104
Oil and natural gas \| Natural gas
Disaggregation of Revenue [Line Items]
Revenue before interest income	435	430	1,375	1,267
Oil and natural gas \| Natural gas liquids
Disaggregation of Revenue [Line Items]
Revenue before interest income	332	363	819	1,222
Oil and natural gas \| Other
Disaggregation of Revenue [Line Items]
Revenue before interest income	0	0	0	0
Oil and natural gas \| Contingent residual payments
Disaggregation of Revenue [Line Items]
Revenue before interest income				0
Oil and natural gas \| United States
Disaggregation of Revenue [Line Items]
Revenue before interest income	0	347	0	1,078
Oil and natural gas \| Canada
Disaggregation of Revenue [Line Items]
Revenue before interest income	3,341	2,806	8,454	9,515
Oil and natural gas \| Goods transferred at a point in time
Disaggregation of Revenue [Line Items]
Revenue before interest income	3,341	3,153	8,454	10,593
Land investment
Disaggregation of Revenue [Line Items]
Revenue before interest income	0	0	70	0
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 \| Other
Disaggregation of Revenue [Line Items]
Revenue before interest income	0	0	70	0
Land investment \| Contingent residual payments
Disaggregation of Revenue [Line Items]
Revenue before interest income				0
Land investment \| United States
Disaggregation of Revenue [Line Items]
Revenue before interest income	0	0	70	0
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	70	0
Other
Disaggregation of Revenue [Line Items]
Revenue before interest income	26	25	71	58
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 \| Other
Disaggregation of Revenue [Line Items]
Revenue before interest income	26	25	71	58
Other \| Contingent residual payments
Disaggregation of Revenue [Line Items]
Revenue before interest income				0
Other \| United States
Disaggregation of Revenue [Line Items]
Revenue before interest income	0	0	0	0
Other \| Canada
Disaggregation of Revenue [Line Items]
Revenue before interest income	26	25	71	58
Other \| Goods transferred at a point in time
Disaggregation of Revenue [Line Items]
Revenue before interest income	$ 26	$ 25	$ 71	$ 58