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SUPPLEMENTARY OIL AND NATURAL GAS INFORMATION (UNAUDITED) (Details)
Mcf in Thousands, MMcf in Thousands, $ in Thousands
12 Months Ended
Sep. 30, 2019
USD ($)
Boe
Mcf
bbl
Sep. 30, 2018
USD ($)
Boe
MMcf
Mcf
bbl
Sep. 30, 2019
USD ($)
Boe
Mcf
bbl
Sep. 30, 2018
USD ($)
Changes in the estimates of net interests in total proved reserves of oil and natural gas liquids and natural gas        
Proved developed reserves - total | Boe     856,000  
Proved undeveloped reserves - total | Boe     1,342,000  
Changes in the estimates of net interests in total proved reserves of oil and natural gas liquids and natural gas        
Balance at the beginning of the period | Boe 2,462,000 931,000    
Revisions of previous estimates | Boe (78,000) (273,000)    
Extensions, discoveries and other additions | Boe 20,000 71,000    
Acquisitions of reserves | Boe 44,000 1,997,000    
Less sales of reserves | Boe   (141,000)    
Less production | Boe (250,000) (123,000)    
Balance at the end of the period | Boe 2,198,000 2,462,000    
Capitalized Costs Relating to Oil and Natural Gas Producing Activities        
Proved properties     $ 62,075 $ 63,766
Unproved properties     130 180
Total capitalized costs     62,205 63,946
Accumulated depletion and depreciation     55,972 48,769
Net capitalized costs     6,233 15,177
Costs Incurred in Oil and Natural Gas Property Acquisition, Exploration and Development        
Acquisition of unproved properties $ 0 $ 6    
Costs Incurred, Acquisition of Oil and Gas Properties with Proved Reserves 668 13,422    
Development costs (622) 0    
Total 46 13,428    
Additions and revisions to asset retirement obligation included in total costs incurred (755) 2,538    
Results of Operations for Oil and Natural Gas Producing Activities        
Net revenues 6,406 3,706    
Production costs (5,213) (2,633)    
Depletion (2,680) (826)    
Reduction of carrying value of oil and natural gas properties 5,710 0    
Pre-tax results of operations (7,197) 247    
Estimated income tax benefit (expense) (160) 83    
Results of operations (7,357) 330    
Standardized Measure of Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Abstract]        
Future cash inflows     65,720 83,947
Future production costs     (54,923) (41,130)
Future development costs     (13,295) (13,753)
Future income tax expenses     (450) (6,236)
Future net cash flows     (2,948) 22,828
10% annual discount for timing of cash flows     5,258 (8,992)
Standardized measure of discounted future net cash flows 2,310 13,836 $ 2,310 $ 13,836
Changes in the Standardized Measure of Discounted Future Net Cash Flows        
Beginning of year 13,836 4,317    
Sales of oil and natural gas produced, net of production costs (1,193) (1,073)    
Net changes in prices and production costs, net of royalties and wellhead taxes (15,358) (726)    
Extensions and discoveries 891 2,224    
Net change due to purchases and sales of minerals in place 334 10,373    
Revisions of previous quantity estimates (71) (491)    
Net change in income taxes 3,792 (3,388)    
Accretion of discount 1,350 418    
Other - changes in the timing of future production and other (932) 2,315    
Other - net change in Canadian dollar translation rate (339) (133)    
Net change (11,526) 9,519    
End of year $ 2,310 $ 13,836    
OIL & NGL (Bbls)        
Changes in the estimates of net interests in total proved reserves of oil and natural gas liquids and natural gas        
Balance at the beginning of the period | bbl 1,590,000 413,000    
Revisions of previous estimates | bbl (74,000) (2,000)    
Extensions, discoveries and other additions | bbl 14,000 46,000    
Acquisitions of reserves | bbl 30,000 1,296,000    
Less sales of reserves | bbl   (96,000)    
Less production | bbl (141,000) (67,000)    
Balance at the end of the period | bbl 1,419,000 1,590,000    
Proved developed reserves - volume | bbl     529,000  
Proved undeveloped reserves - volume | bbl     890,000  
Natural gas        
Changes in the estimates of net interests in total proved reserves of oil and natural gas liquids and natural gas        
Balance at the beginning of the period | Mcf 5,055 3,005    
Revisions of previous estimates | Mcf (21) (1,571)    
Extensions, discoveries and other additions 33 144    
Acquisitions of reserves | Mcf 81 4,060    
Less sales of reserves | Mcf   (255)    
Less production | Mcf (628) (328)    
Balance at the end of the period | Mcf 4,520 5,055    
Proved developed reserves - volume | Mcf     1,900  
Proved undeveloped reserves - volume | Mcf     2,620