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INFORMATION RELATING TO THE CONSOLIDATED STATEMENTS OF CASH FLOWS (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Increase (decrease) from changes in:    
Receivables $ (574) $ (116)
Income tax receivable (535) (50)
Other current assets (100) (289)
Accounts payable 124 (279)
Accrued compensation 239 (72)
Other current liabilities (508) 192
Decrease from changes in current assets and liabilities (1,354) (614)
Supplemental disclosure of cash flow information:    
Interest 6 6
Income taxes refunded, net (16) (90)
Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract]    
Canadian income tax withholding on proceeds from sale of oil and natural gas properties 858 665
Supplemental disclosures of cash flow information:    
Increase in capital expenditure accruals related to oil and natural gas asset retirement obligations 2,538 188
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 (108) (101)
Increase in capital expenditure accruals related to oil and natural gas asset retirement obligations $ 2,538 $ 188