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INFORMATION RELATING TO THE CONSOLIDATED STATEMENTS OF CASH FLOWS (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Increase (decrease) from changes in:    
Receivables $ (166) $ 933
Other current assets (289) 197
Accounts payable (279) (1,456)
Accrued compensation (72) (79)
Other current liabilities 192 (882)
Decrease from changes in current assets and liabilities (614) (1,287)
Supplemental disclosure of cash flow information:    
Interest 6 94
Income taxes refunded, net (90) (219)
Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract]    
Income tax withholding on proceeds from sale of oil and natural gas properties 665 0
Supplemental disclosures of cash flow information:    
Increase in capital expenditure accruals related to oil and natural gas asset retirement obligations 188 99
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 (101) 76
Increase in capital expenditure accruals related to oil and natural gas asset retirement obligations $ 188 $ 99