REVENUE FROM CONTRACTS WITH CUSTOMERS - DISAGGREGATION OF REVENUE (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2025	Mar. 31, 2024
Disaggregation of Revenue [Line Items]
Revenue before interest income	$ 3,565	$ 4,660	$ 7,473	$ 9,807
Oil
Disaggregation of Revenue [Line Items]
Revenue before interest income	2,601	2,985	5,744	6,877
Natural gas
Disaggregation of Revenue [Line Items]
Revenue before interest income	488	678	837	1,390
Natural gas liquids
Disaggregation of Revenue [Line Items]
Revenue before interest income	454	481	859	1,007
Contingent residual payments
Disaggregation of Revenue [Line Items]
Revenue before interest income		500		500
Other
Disaggregation of Revenue [Line Items]
Revenue before interest income	22	16	33	33
United States
Disaggregation of Revenue [Line Items]
Revenue before interest income	376	1,174	731	1,928
Canada
Disaggregation of Revenue [Line Items]
Revenue before interest income	3,189	3,486	6,742	7,879
Goods transferred at a point in time
Disaggregation of Revenue [Line Items]
Revenue before interest income	3,565	4,660	7,473	9,807
Oil and natural gas
Disaggregation of Revenue [Line Items]
Revenue before interest income	3,543	4,144	7,440	9,274
Oil and natural gas | Oil
Disaggregation of Revenue [Line Items]
Revenue before interest income	2,601	2,985	5,744	6,877
Oil and natural gas | Natural gas
Disaggregation of Revenue [Line Items]
Revenue before interest income	488	678	837	1,390
Oil and natural gas | Natural gas liquids
Disaggregation of Revenue [Line Items]
Revenue before interest income	454	481	859	1,007
Oil and natural gas | Contingent residual payments
Disaggregation of Revenue [Line Items]
Revenue before interest income		0		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	376	674	731	1,428
Oil and natural gas | Canada
Disaggregation of Revenue [Line Items]
Revenue before interest income	3,167	3,470	6,709	7,846
Oil and natural gas | Goods transferred at a point in time
Disaggregation of Revenue [Line Items]
Revenue before interest income	3,543	4,144	7,440	9,274
Land investment
Disaggregation of Revenue [Line Items]
Revenue before interest income	0	500	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		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	500	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	500	0	500
Other
Disaggregation of Revenue [Line Items]
Revenue before interest income	22	16	33	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 | Contingent residual payments
Disaggregation of Revenue [Line Items]
Revenue before interest income				0
Other | Other
Disaggregation of Revenue [Line Items]
Revenue before interest income	22	16	33	33
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	22	16	33	33
Other | Goods transferred at a point in time
Disaggregation of Revenue [Line Items]
Revenue before interest income	$ 22	$ 16	$ 33	$ 33