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INFORMATION RELATING TO THE CONSOLIDATED STATEMENTS OF CASH FLOWS (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Increase (decrease) from changes in:    
Receivables $ (260) $ (574)
Income tax receivable 758 (535)
Other current assets (188) (100)
Accounts payable (202) 124
Accrued compensation (317) 239
Other current liabilities 1,451 (508)
Increase (decrease) from changes in current assets and liabilities 1,242 (1,354)
Supplemental disclosure of cash flow information:    
Income taxes refunded, net (2,302) (16)
Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract]    
Canadian income tax withholding on proceeds from sale of oil and natural gas properties 0 858
Supplemental disclosures of cash flow information:    
Increase (decrease) in capital expenditure accruals related to oil and natural gas asset retirement obligations (755) 2,538
Oil and natural gas    
Supplemental disclosures of cash flow information:    
Increase (decrease) in capital expenditure accruals related to oil and natural gas exploration and development 60 (108)
Increase (decrease) in capital expenditure accruals related to oil and natural gas asset retirement obligations $ (755) $ 2,538