Note 1 - Summary of Significant Accounting Policies - Schedule of Regulatory Assets and Liabilities (Details) - USD ($)	Sep. 30, 2024	Sep. 30, 2023
Regulatory assets	$ 5,103,910	$ 2,854,276
Noncurrent regulatory assets	4,445,044	5,389,445
Total regulatory assets	9,548,954	8,243,721
Regulatory liabilities	834,278	1,632,716
Regulatory cost of retirement obligations	14,409,847	13,029,376
Regulatory Liability, Noncurrent	19,326,567	18,031,693
Total non-current	33,736,414	31,061,069
Total regulatory liabilities	34,570,692	32,693,785
Over-recovery of SAVE Plan Revenues [Member]
Regulatory liabilities	0	146,861
Rate Refund [Member]
Regulatory liabilities	37,500	652,018
Deferred Income Tax Charge [Member]
Regulatory liabilities	591,764	527,034
Regulatory Liability, Noncurrent	15,468,096	16,249,776
Supplier Refund [Member]
Regulatory liabilities	30,556	275,649
Other Deferred Liabilities [Member]
Regulatory liabilities	174,458	31,154
Other Regulatory Assets (Liabilities) [Member]
Regulatory Liability, Noncurrent	3,858,471	1,781,917
WNA [Member]
Regulatory assets	919,375	414,689
Regulatory Clause Revenues, under-Recovered [Member]
Regulatory assets	2,690,247	1,383,340
Under-recovery of RNG Revenues [Member]
Regulatory assets	1,331,064	797,804
Under-recovery of SAVE Plan Revenues [Member]
Regulatory assets	107,678	0
Pension Costs [Member]
Regulatory assets	42,785	243,017
Noncurrent regulatory assets	2,998,881	3,786,265
Other Deferred Expenses [Member]
Regulatory assets	12,761	15,426
Deferred Gain (Loss) on Early Extinguishment of Debt [Member]
Noncurrent regulatory assets	1,141,872	1,256,059
Total regulatory assets	1,141,872	1,256,059
Other Assets [Member]
Noncurrent regulatory assets	$ 304,291	$ 347,121