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SUPPLEMENTARY OIL AND NATURAL GAS INFORMATION (UNAUDITED) (Tables)
 12 Months Ended
Sep. 30, 2025
Oil and Gas Disclosure [Abstract]  
Summary of changes in the estimates of net interests in total proved developed and total proved undeveloped reserves of oil, natural gas liquids and natural gas
Oil
(Bbls)
CanadaUnited StatesTotal
Proved reserves:   
Balance at September 30, 2023787,000 112,000 899,000 
Revisions of previous estimates222,000 (3,000)219,000 
Extensions, discoveries and other additions117,000 — 117,000 
Acquisitions of reserves4,000 — 4,000 
Less sales of reserves(54,000)— (54,000)
Less production(184,000)(19,000)(203,000)
Balance at September 30, 2024892,000 90,000 982,000 
Revisions of previous estimates(65,000)(1,000)(66,000)
Less sales of reserves(20,000)(79,000)(99,000)
Less production(164,000)(10,000)(174,000)
Proved Reserves, September 30, 2025643,000 — 643,000 
NGL
(Bbls)
CanadaUnited StatesTotal
Proved reserves:   
Balance at September 30, 2023150,000 177,000 327,000 
Revisions of previous estimates70,000 15,000 85,000 
Extensions, discoveries and other additions15,000 — 15,000 
Acquisitions of reserves2,000 — 2,000 
Less sales of reserves(2,000)— (2,000)
Less production(36,000)(28,000)(64,000)
Balance at September 30, 2024199,000 164,000 363,000 
Revisions of previous estimates44,000 (22,000)22,000 
Less sales of reserves(35,000)(129,000)(164,000)
Less production(43,000)(13,000)(56,000)
Proved Reserves, September 30, 2025165,000 — 165,000 

Natural Gas
(Mcf)
CanadaUnited StatesTotal
Proved reserves:   
Balance at September 30, 20235,010,000 1,691,000 6,701,000 
Revisions of previous estimates826,000 82,000 908,000 
Extensions, discoveries and other additions313,000 — 313,000 
Acquisitions of reserves16,000 — 16,000 
Less sales of reserves(139,000)— (139,000)
Less production(1,085,000)(259,000)(1,344,000)
Balance at September 30, 20244,941,000 1,514,000 6,455,000 
Revisions of previous estimates(263,000)(66,000)(329,000)
Less sales of reserves(283,000)(1,309,000)(1,592,000)
Less production(966,000)(139,000)(1,105,000)
Proved Reserves, September 30, 20253,429,000 — 3,429,000 
Total Equivalent Reserves
(Boe)
CanadaUnited StatesTotal
Proved reserves:   
Balance at September 30, 20231,772,000 571,000 2,343,000 
Revisions of previous estimates430,000 27,000 457,000 
Extensions, discoveries and other additions184,000 — 184,000 
Acquisitions of reserves9,000 — 9,000 
Less sales of reserves(79,000)— (79,000)
Less production(401,000)(90,000)(491,000)
Balance at September 30, 20241,915,000 508,000 2,423,000 
Revisions of previous estimates(65,000)(37,000)(102,000)
Less sales of reserves(102,000)(425,000)(527,000)
Less production(368,000)(46,000)(414,000)
Proved Reserves, September 30, 20251,380,000 — 1,380,000 

The following tables summarize changes in the estimates of Barnwell’s net interests in total proved undeveloped reserves and presents the balances of total proved developed reserves of oil and natural gas liquids and natural gas, which are now all located in Canada. Proved developed oil and natural gas reserves are proved reserves that can be expected to be recovered through existing wells and equipment in place and under operating methods being utilized at the time the estimates were made.
Oil
(Bbls)
CanadaUnited StatesTotal
Proved undeveloped reserves:   
Balance at September 30, 202392,000 — 92,000 
Conversion to proved developed reserves(98,000)— (98,000)
Revisions of previous estimates6,000 — 6,000 
Additions due to a new well109,000 — 109,000 
Balance at September 30, 2024109,000 — 109,000 
Revisions of previous estimates(109,000)— (109,000)
Proved Undeveloped Reserves, September 30, 2025— — — 
Proved Developed Reserves, September 30, 2024783,000 90,000 873,000 
Proved Developed Reserves, September 30, 2025643,000 — 643,000 
NGL
(Bbls)
CanadaUnited StatesTotal
Proved undeveloped reserves:   
Balance at September 30, 202318,000 — 18,000 
Conversion to proved developed reserves(10,000)— (10,000)
Revisions of previous estimates(8,000)— (8,000)
Additions due to a new well23,000 — 23,000 
Balance at September 30, 202423,000 — 23,000 
Revisions of previous estimates(23,000)— (23,000)
Proved Undeveloped Reserves, September 30, 2025— — — 
Proved Developed Reserves, September 30, 2024176,000 164,000 340,000 
Proved Developed Reserves, September 30, 2025165,000 — 165,000 

Natural Gas
(Mcf)
CanadaUnited StatesTotal
Proved undeveloped reserves:   
Balance at September 30, 2023608,000 — 608,000 
Conversion to proved developed reserves(279,000)— (279,000)
Revisions of previous estimates(330,000)— (330,000)
Additions due to a new well641,000 — 641,000 
Balance at September 30, 2024640,000 — 640,000 
Revisions of previous estimates(640,000)— (640,000)
Proved Undeveloped Reserves, September 30, 2025— — — 
Proved Developed Reserves, September 30, 20244,301,000 1,514,000 5,815,000 
Proved Developed Reserves, September 30, 20253,429,000 — 3,429,000 
Total Equivalent Reserves
(Boe)
CanadaUnited StatesTotal
Proved undeveloped reserves:   
Balance at September 30, 2023211,000 — 211,000 
Conversion to proved developed reserves(155,000)— (155,000)
Revisions of previous estimates(56,000)— (56,000)
Additions due to a new well239,000 — 239,000 
Balance at September 30, 2024239,000 — 239,000 
Revisions of previous estimates(239,000)— (239,000)
Proved Undeveloped Reserves, September 30, 2025— — — 
Proved Developed Reserves, September 30, 20241,676,000 508,000 2,184,000 
Proved Developed Reserves, September 30, 20251,380,000 — 1,380,000 
Schedule of capitalized costs relating to oil and natural gas producing activities
All capitalized costs relating to oil and natural gas producing activities in Canada and the U.S. are summarized as follows:
 September 30, 2025
 CanadaUnited StatesTotal
Proved properties$74,511,000 $— $74,511,000 
Unproved properties— — — 
Total capitalized costs74,511,000 — 74,511,000 
Accumulated depletion, depreciation, and impairment65,358,000 — 65,358,000 
Net capitalized costs$9,153,000 $— $9,153,000 

 September 30, 2024
 CanadaUnited StatesTotal
Proved properties$76,963,000 $6,594,000 $83,557,000 
Unproved properties— — — 
Total capitalized costs76,963,000 6,594,000 83,557,000 
Accumulated depletion, depreciation, and impairment64,402,000 2,601,000 67,003,000 
Net capitalized costs$12,561,000 $3,993,000 $16,554,000 
Schedule of costs incurred in oil and natural gas property acquisition, exploration and development
 Year ended September 30, 2025
 CanadaUnited StatesTotal
Acquisition of properties:  
Proved$— $— $— 
Unproved— — — 
Exploration costs22,000 — 22,000 
Development costs234,000 — 234,000 
Total$256,000 $— $256,000 

 Year ended September 30, 2024
 CanadaUnited StatesTotal
Acquisition of properties:  
Proved$146,000 $— $146,000 
Unproved— — — 
Exploration costs34,000 — 34,000 
Development costs3,865,000 183,000 4,048,000 
Total$4,045,000 $183,000 $4,228,000 
Schedule of results of operations for oil and natural gas producing activities
 Year ended September 30, 2025
 CanadaUnited StatesTotal
Net revenues$12,392,000 $1,171,000 $13,563,000 
Production costs(8,546,000)(420,000)(8,966,000)
Depletion(2,801,000)(343,000)(3,144,000)
Impairment of assets— (865,000)(865,000)
Pre-tax results of operations (1)
1,045,000 (457,000)588,000 
Estimated income tax expense (2)
214,000 10,000 224,000 
Results of operations (1)
$831,000 $(467,000)$364,000 

 Year ended September 30, 2024
 CanadaUnited StatesTotal
Net revenues$15,093,000 $2,303,000 $17,396,000 
Production costs(9,230,000)(619,000)(9,849,000)
Depletion(4,139,000)(808,000)(4,947,000)
Impairment of assets(2,164,000)(721,000)(2,885,000)
Pre-tax results of operations (1)
(440,000)155,000 (285,000)
Estimated income tax expense (2)
320,000 20,000 340,000 
Results of operations (1)
$(760,000)$135,000 $(625,000)
_________________
(1)   Before general and administrative expenses, interest expense, and foreign exchange gains and losses.
(2) Estimated income tax expense includes changes to the deferred income tax valuation allowance necessary for the portion of Canadian and U.S. federal tax law deferred tax assets that may not be realizable.
Schedule of standardized measure of discounted future net cash flows
 Year ended September 30, 2025
 CanadaUnited StatesTotal
Future cash inflows$48,624,000 $— $48,624,000 
Future production costs(30,967,000)— (30,967,000)
Future development costs(50,000)— (50,000)
Future income tax expenses(972,000)— (972,000)
Future net cash flows excluding abandonment, decommissioning and reclamation16,635,000 — 16,635,000 
Future abandonment, decommissioning and reclamation(18,007,000)— (18,007,000)
Future net cash flows(1,372,000)— (1,372,000)
10% annual discount for timing of cash flows8,042,000 — 8,042,000 
Standardized measure of discounted future net cash flows$6,670,000 $— $6,670,000 
 Year ended September 30, 2024
 CanadaUnited StatesTotal
Future cash inflows$75,293,000 $12,043,000 $87,336,000 
Future production costs(42,601,000)(5,080,000)(47,681,000)
Future development costs(2,795,000)— (2,795,000)
Future income tax expenses(2,666,000)(161,000)(2,827,000)
Future net cash flows excluding abandonment, decommissioning and reclamation27,231,000 6,802,000 34,033,000 
Future abandonment, decommissioning and reclamation(18,026,000)(50,000)(18,076,000)
Future net cash flows9,205,000 6,752,000 15,957,000 
10% annual discount for timing of cash flows2,697,000 (2,804,000)(107,000)
Standardized measure of discounted future net cash flows$11,902,000 $3,948,000 $15,850,000 
Schedule of changes in standardized measure of discounted future net cash flows
 Year ended September 30,
 20252024
Beginning of year$15,850,000 $19,913,000 
Sales of oil and natural gas produced, net of production costs(4,597,000)(7,547,000)
Net changes in prices and production costs, net of royalties and wellhead taxes(2,132,000)(12,201,000)
Extensions and discoveries— 1,725,000 
Net change due to purchases and sales of minerals in place(3,715,000)(895,000)
Changes in future development costs2,610,000 170,000 
Revisions of previous quantity estimates(1,618,000)9,478,000 
Net change in income taxes(854,000)1,786,000 
Accretion of discount1,156,000 3,359,000 
Other - changes in the timing of future production and other354,000 76,000 
Other - net change in Canadian dollar translation rate(384,000)(14,000)
Net change(9,180,000)(4,063,000)
End of year$6,670,000 $15,850,000