INCOME TAXES - TAX EFFECTS OF TEMPORARY DIFFERENCES (Details) - USD ($)	Sep. 30, 2025	Sep. 30, 2024
Deferred income tax assets:
Foreign tax credit carryover under U.S. tax law	$ 0	$ 916,000
U.S. federal net operating loss carryover	9,463,000	10,382,000
U.S. state unitary net operating loss carryovers	484,000	1,334,000
Canadian net operating loss carryovers	1,490,000	1,331,000
Tax basis of investment in land in excess of book basis under U.S. tax law	11,000	11,000
Tax basis of investment in subsidiary in excess of book basis under U.S. tax law	376,000	0
Property and equipment accumulated book depreciation and depletion in excess of tax under Canadian tax law	123,000	0
Property and equipment accumulated book depreciation and depletion in excess of tax under U.S. tax law	661,000	548,000
Asset retirement obligation accrued for books but not for tax under U.S. tax law	835,000	907,000
Asset retirement obligation accrued for books but not for tax under Canadian tax law	1,941,000	2,141,000
Other liabilities accrued for books but not for tax under U.S. tax law	523,000	669,000
Foreign currency loss under U.S. tax law	76,000	68,000
Foreign currency loss under Canadian tax law	36,000	79,000
Other	195,000	168,000
Total gross deferred income tax assets	16,214,000	18,554,000
Less Valuation allowance	(12,391,000)	(13,896,000)
Net deferred income tax assets	3,823,000	4,658,000
Deferred income tax liabilities:
Property and equipment accumulated tax depreciation and depletion in excess of book under Canadian tax law	0	(117,000)
Book basis of investment in land development partnerships in excess of tax basis under U.S. tax law	(64,000)	(282,000)
Book basis of investment in land development partnerships in excess of tax basis under U.S. state non-unitary tax law	(19,000)	(86,000)
U.S. oil and gas property and equipment accumulated tax depreciation and depletion in excess of book under U.S. tax law	0	(698,000)
U.S. oil and gas property and equipment accumulated tax depreciation and depletion in excess of book under U.S. state tax law	0	(16,000)
U.S. tax law impact of foreign branch deferred tax asset under Canadian tax law	(2,374,000)	(2,215,000)
Asset for retirement benefits	(1,245,000)	(1,029,000)
Other	(139,000)	(315,000)
Total deferred income tax liabilities	(3,841,000)	(4,758,000)
Net deferred income tax liability	(18,000)	(100,000)
Net deferred income tax liability included in Consolidated Balance Sheets:
Deferred income tax assets	0	0
Deferred income tax liabilities	(18,000)	(100,000)
Net deferred income tax liability	$ (18,000)	$ (100,000)