SUPPLEMENTARY OIL AND NATURAL GAS INFORMATION (UNAUDITED) (Details) Mcf in Thousands, $ in Thousands	12 Months Ended
	Sep. 30, 2018 USD ($) Boe Mcf bbl	Sep. 30, 2017 USD ($) Boe Mcf bbl	Sep. 30, 2018 USD ($) Boe Mcf bbl	Sep. 30, 2017 USD ($)
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			1,107,000
Proved undeveloped reserves - total | Boe			1,355,000
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	931,000	698,000
Revisions of previous estimates | Boe	(273,000)	447,000
Extensions, discoveries and other additions | Boe	71,000
Acquisitions of reserves | Boe	1,997,000	38,000
Less sales of reserves | Boe	(141,000)	(101,000)
Less production | Boe	(123,000)	(151,000)
Balance at the end of the period | Boe	2,462,000	931,000
Capitalized Costs Relating to Oil and Natural Gas Producing Activities
Proved properties			$ 63,766	$ 68,522
Unproved properties			180	186
Total capitalized costs			63,946	68,708
Accumulated depletion and depreciation			48,769	64,915
Net capitalized costs			15,177	3,793
Costs Incurred in Oil and Natural Gas Property Acquisition, Exploration and Development
Acquisition of unproved properties	$ 6	$ 70
Acquisition of proved properties	13,422	381
Development costs	0	586
Total	13,428	1,037
Additions and revisions to asset retirement obligation included in total costs incurred	2,538	188
Results of Operations for Oil and Natural Gas Producing Activities
Net revenues	3,706	4,383
Production costs	(2,633)	(3,028)
Depletion	(826)	(848)
Pre-tax results of operations	247	507
Estimated income tax benefit (expense)	83	282
Results of operations	330	789
Standardized Measure of Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Abstract]
Future cash inflows			83,947	24,786
Future production costs			(41,130)	(15,140)
Future development costs			(13,753)	(1,172)
Future income tax expenses			(6,236)	(2,401)
Future net cash flows			22,828	6,073
10% annual discount for timing of cash flows			(8,992)	(1,756)
Standardized measure of discounted future net cash flows	4,317	2,910	$ 13,836	$ 4,317
Changes in the Standardized Measure of Discounted Future Net Cash Flows
Beginning of year	4,317	2,910
Sales of oil and natural gas produced, net of production costs	(1,073)	(1,355)
Net changes in prices and production costs, net of royalties and wellhead taxes	(726)	3,033
Extensions and discoveries	2,224	0
Net change due to purchases and sales of minerals in place	10,373	(305)
Revisions of previous quantity estimates	(491)	511
Net change in income taxes	(3,388)	(1,247)
Accretion of discount	418	305
Other - changes in the timing of future production and other	2,315	400
Other - net change in Canadian dollar translation rate	(133)	65
Net change	9,519	1,407
End of year	$ 13,836	$ 4,317
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	413,000	450,000
Revisions of previous estimates | bbl	(2,000)	85,000
Extensions, discoveries and other additions | bbl	46,000
Acquisitions of reserves | bbl	1,296,000	31,000
Less sales of reserves | bbl	(96,000)	(67,000)
Less production | bbl	(67,000)	(86,000)
Balance at the end of the period | bbl	1,590,000	413,000
Proved developed reserves - volume | bbl			693,000
Proved undeveloped reserves - volume | bbl			897,000
GAS (Mcf)
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	3,005	1,441
Revisions of previous estimates | Mcf	(1,571)	2,103
Extensions, discoveries and other additions | Mcf	144
Acquisitions of reserves | Mcf	4,060	39
Less sales of reserves | Mcf	(255)	(200)
Less production | Mcf	(328)	(378)
Balance at the end of the period | Mcf	5,055	3,005
Proved developed reserves - volume | Mcf			2,399
Proved undeveloped reserves - volume | Mcf			2,656