REVENUE FROM CONTRACTS WITH CUSTOMERS REVENUE FROM CONTRACTS WITH CUSTOMERS - DISAGGREGATION OF REVENUE (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Disaggregation of Revenue [Line Items]
Revenue before interest income	$ 2,574	$ 1,823
Oil
Disaggregation of Revenue [Line Items]
Revenue before interest income	896
Natural gas
Disaggregation of Revenue [Line Items]
Revenue before interest income	162
Natural gas liquids
Disaggregation of Revenue [Line Items]
Revenue before interest income	174
Drilling and pump
Disaggregation of Revenue [Line Items]
Revenue before interest income	1,163
Contingent residual payments
Disaggregation of Revenue [Line Items]
Revenue before interest income	165
Other
Disaggregation of Revenue [Line Items]
Revenue before interest income	14
United States
Disaggregation of Revenue [Line Items]
Revenue before interest income	1,328
Canada
Disaggregation of Revenue [Line Items]
Revenue before interest income	1,246
Goods transferred at a point in time
Disaggregation of Revenue [Line Items]
Revenue before interest income	1,411
Services transferred over time
Disaggregation of Revenue [Line Items]
Revenue before interest income	1,163
Oil and natural gas
Disaggregation of Revenue [Line Items]
Revenue before interest income	1,232	953
Oil and natural gas | Oil
Disaggregation of Revenue [Line Items]
Revenue before interest income	896
Oil and natural gas | Natural gas
Disaggregation of Revenue [Line Items]
Revenue before interest income	162
Oil and natural gas | Natural gas liquids
Disaggregation of Revenue [Line Items]
Revenue before interest income	174
Oil and natural gas | Drilling and pump
Disaggregation of Revenue [Line Items]
Revenue before interest income	0
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
Oil and natural gas | United States
Disaggregation of Revenue [Line Items]
Revenue before interest income	0
Oil and natural gas | Canada
Disaggregation of Revenue [Line Items]
Revenue before interest income	1,232
Oil and natural gas | Goods transferred at a point in time
Disaggregation of Revenue [Line Items]
Revenue before interest income	1,232
Oil and natural gas | Services transferred over time
Disaggregation of Revenue [Line Items]
Revenue before interest income	0
Contract drilling
Disaggregation of Revenue [Line Items]
Revenue before interest income	1,163	842
Contract drilling | Oil
Disaggregation of Revenue [Line Items]
Revenue before interest income	0
Contract drilling | Natural gas
Disaggregation of Revenue [Line Items]
Revenue before interest income	0
Contract drilling | Natural gas liquids
Disaggregation of Revenue [Line Items]
Revenue before interest income	0
Contract drilling | Drilling and pump
Disaggregation of Revenue [Line Items]
Revenue before interest income	1,163
Contract drilling | Contingent residual payments
Disaggregation of Revenue [Line Items]
Revenue before interest income	0
Contract drilling | Other
Disaggregation of Revenue [Line Items]
Revenue before interest income	0
Contract drilling | United States
Disaggregation of Revenue [Line Items]
Revenue before interest income	1,163
Contract drilling | Canada
Disaggregation of Revenue [Line Items]
Revenue before interest income	0
Contract drilling | Goods transferred at a point in time
Disaggregation of Revenue [Line Items]
Revenue before interest income	0
Contract drilling | Services transferred over time
Disaggregation of Revenue [Line Items]
Revenue before interest income	1,163
Land investment
Disaggregation of Revenue [Line Items]
Revenue before interest income	165	0
Land investment | Oil
Disaggregation of Revenue [Line Items]
Revenue before interest income	0
Land investment | Natural gas
Disaggregation of Revenue [Line Items]
Revenue before interest income	0
Land investment | Natural gas liquids
Disaggregation of Revenue [Line Items]
Revenue before interest income	0
Land investment | Drilling and pump
Disaggregation of Revenue [Line Items]
Revenue before interest income	0
Land investment | Contingent residual payments
Disaggregation of Revenue [Line Items]
Revenue before interest income	165
Land investment | Other
Disaggregation of Revenue [Line Items]
Revenue before interest income	0
Land investment | United States
Disaggregation of Revenue [Line Items]
Revenue before interest income	165
Land investment | Canada
Disaggregation of Revenue [Line Items]
Revenue before interest income	0
Land investment | Goods transferred at a point in time
Disaggregation of Revenue [Line Items]
Revenue before interest income	165
Land investment | Services transferred over time
Disaggregation of Revenue [Line Items]
Revenue before interest income	0
Other
Disaggregation of Revenue [Line Items]
Revenue before interest income	14	$ 28
Other | Oil
Disaggregation of Revenue [Line Items]
Revenue before interest income	0
Other | Natural gas
Disaggregation of Revenue [Line Items]
Revenue before interest income	0
Other | Natural gas liquids
Disaggregation of Revenue [Line Items]
Revenue before interest income	0
Other | Drilling and pump
Disaggregation of Revenue [Line Items]
Revenue before interest income	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	14
Other | United States
Disaggregation of Revenue [Line Items]
Revenue before interest income	0
Other | Canada
Disaggregation of Revenue [Line Items]
Revenue before interest income	14
Other | Goods transferred at a point in time
Disaggregation of Revenue [Line Items]
Revenue before interest income	14
Other | Services transferred over time
Disaggregation of Revenue [Line Items]
Revenue before interest income	$ 0