REVENUE FROM CONTRACTS WITH CUSTOMERS - DISAGGREGATION OF REVENUE (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2026	Mar. 31, 2025
Disaggregation of Revenue [Line Items]
Revenue before interest income	$ 2,497	$ 3,565	$ 5,228	$ 7,473
Oil
Disaggregation of Revenue [Line Items]
Revenue before interest income	1,783	2,601	3,686	5,744
Natural gas
Disaggregation of Revenue [Line Items]
Revenue before interest income	469	488	940	837
Natural gas liquids
Disaggregation of Revenue [Line Items]
Revenue before interest income	231	454	487	859
Other
Disaggregation of Revenue [Line Items]
Revenue before interest income	14	22	115	33
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	376	70	731
Canada
Disaggregation of Revenue [Line Items]
Revenue before interest income	2,497	3,189	5,158	6,742
Goods transferred at a point in time
Disaggregation of Revenue [Line Items]
Revenue before interest income	2,497	3,565	5,228	7,473
Oil and natural gas
Disaggregation of Revenue [Line Items]
Revenue before interest income	2,483	3,543	5,113	7,440
Oil and natural gas | Oil
Disaggregation of Revenue [Line Items]
Revenue before interest income	1,783	2,601	3,686	5,744
Oil and natural gas | Natural gas
Disaggregation of Revenue [Line Items]
Revenue before interest income	469	488	940	837
Oil and natural gas | Natural gas liquids
Disaggregation of Revenue [Line Items]
Revenue before interest income	231	454	487	859
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	376	0	731
Oil and natural gas | Canada
Disaggregation of Revenue [Line Items]
Revenue before interest income	2,483	3,167	5,113	6,709
Oil and natural gas | Goods transferred at a point in time
Disaggregation of Revenue [Line Items]
Revenue before interest income	2,483	3,543	5,113	7,440
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	14	22	45	33
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	14	22	45	33
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	14	22	45	33
Other | Goods transferred at a point in time
Disaggregation of Revenue [Line Items]
Revenue before interest income	$ 14	$ 22	$ 45	$ 33