REVENUE FROM CONTRACTS WITH CUSTOMERS - DISAGGREGATION OF REVENUE (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Disaggregation of Revenue [Line Items]
Revenue before interest income	$ 4,387	$ 4,843
Oil
Disaggregation of Revenue [Line Items]
Revenue before interest income	1,380	1,725
Natural gas
Disaggregation of Revenue [Line Items]
Revenue before interest income	375	322
Natural gas liquids
Disaggregation of Revenue [Line Items]
Revenue before interest income	132	94
Drilling and pump
Disaggregation of Revenue [Line Items]
Revenue before interest income	1,942	2,646
Contingent residual payments
Disaggregation of Revenue [Line Items]
Revenue before interest income	485	0
Other
Disaggregation of Revenue [Line Items]
Revenue before interest income	73	56
United States
Disaggregation of Revenue [Line Items]
Revenue before interest income	2,427	2,653
Canada
Disaggregation of Revenue [Line Items]
Revenue before interest income	1,960	2,190
Goods transferred at a point in time
Disaggregation of Revenue [Line Items]
Revenue before interest income	2,445	2,197
Services transferred over time
Disaggregation of Revenue [Line Items]
Revenue before interest income	1,942	2,646
Oil and natural gas
Disaggregation of Revenue [Line Items]
Revenue before interest income	1,887	2,141
Oil and natural gas | Oil
Disaggregation of Revenue [Line Items]
Revenue before interest income	1,380	1,725
Oil and natural gas | Natural gas
Disaggregation of Revenue [Line Items]
Revenue before interest income	375	322
Oil and natural gas | Natural gas liquids
Disaggregation of Revenue [Line Items]
Revenue before interest income	132	94
Oil and natural gas | Drilling and pump
Disaggregation of Revenue [Line Items]
Revenue before interest income	0	0
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
Oil and natural gas | United States
Disaggregation of Revenue [Line Items]
Revenue before interest income	0	0
Oil and natural gas | Canada
Disaggregation of Revenue [Line Items]
Revenue before interest income	1,887	2,141
Oil and natural gas | Goods transferred at a point in time
Disaggregation of Revenue [Line Items]
Revenue before interest income	1,887	2,141
Oil and natural gas | Services transferred over time
Disaggregation of Revenue [Line Items]
Revenue before interest income	0	0
Contract drilling
Disaggregation of Revenue [Line Items]
Revenue before interest income	1,942	2,646
Contract drilling | Oil
Disaggregation of Revenue [Line Items]
Revenue before interest income	0	0
Contract drilling | Natural gas
Disaggregation of Revenue [Line Items]
Revenue before interest income	0	0
Contract drilling | Natural gas liquids
Disaggregation of Revenue [Line Items]
Revenue before interest income	0	0
Contract drilling | Drilling and pump
Disaggregation of Revenue [Line Items]
Revenue before interest income	1,942	2,646
Contract drilling | Contingent residual payments
Disaggregation of Revenue [Line Items]
Revenue before interest income	0	0
Contract drilling | Other
Disaggregation of Revenue [Line Items]
Revenue before interest income	0	0
Contract drilling | United States
Disaggregation of Revenue [Line Items]
Revenue before interest income	1,942	2,646
Contract drilling | Canada
Disaggregation of Revenue [Line Items]
Revenue before interest income	0	0
Contract drilling | Goods transferred at a point in time
Disaggregation of Revenue [Line Items]
Revenue before interest income	0	0
Contract drilling | Services transferred over time
Disaggregation of Revenue [Line Items]
Revenue before interest income	1,942	2,646
Land investment
Disaggregation of Revenue [Line Items]
Revenue before interest income	485	0
Land investment | Oil
Disaggregation of Revenue [Line Items]
Revenue before interest income	0	0
Land investment | Natural gas
Disaggregation of Revenue [Line Items]
Revenue before interest income	0	0
Land investment | Natural gas liquids
Disaggregation of Revenue [Line Items]
Revenue before interest income	0	0
Land investment | Drilling and pump
Disaggregation of Revenue [Line Items]
Revenue before interest income	0	0
Land investment | Contingent residual payments
Disaggregation of Revenue [Line Items]
Revenue before interest income	485	0
Land investment | Other
Disaggregation of Revenue [Line Items]
Revenue before interest income	0	0
Land investment | United States
Disaggregation of Revenue [Line Items]
Revenue before interest income	485	0
Land investment | Canada
Disaggregation of Revenue [Line Items]
Revenue before interest income	0	0
Land investment | Goods transferred at a point in time
Disaggregation of Revenue [Line Items]
Revenue before interest income	485	0
Land investment | Services transferred over time
Disaggregation of Revenue [Line Items]
Revenue before interest income	0	0
Other
Disaggregation of Revenue [Line Items]
Revenue before interest income	73	56
Other | Oil
Disaggregation of Revenue [Line Items]
Revenue before interest income	0	0
Other | Natural gas
Disaggregation of Revenue [Line Items]
Revenue before interest income	0	0
Other | Natural gas liquids
Disaggregation of Revenue [Line Items]
Revenue before interest income	0	0
Other | Drilling and pump
Disaggregation of Revenue [Line Items]
Revenue before interest income	0	0
Other | Contingent residual payments
Disaggregation of Revenue [Line Items]
Revenue before interest income	0	0
Other | Other
Disaggregation of Revenue [Line Items]
Revenue before interest income	73	56
Other | United States
Disaggregation of Revenue [Line Items]
Revenue before interest income	0	7
Other | Canada
Disaggregation of Revenue [Line Items]
Revenue before interest income	73	49
Other | Goods transferred at a point in time
Disaggregation of Revenue [Line Items]
Revenue before interest income	73	56
Other | Services transferred over time
Disaggregation of Revenue [Line Items]
Revenue before interest income	$ 0	$ 0