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CONDENSED CONSOLIDATED STATEMENTS OF CAPITAL STOCK AND LONG-TERM DEBT (Unaudited) (Parentheticals) - $ / shares	Sep. 30, 2025	Dec. 31, 2024
Cumulative preferred stock, price (in dollars per share)	$ 7.00
First Mortgage Bonds | Minimum
Interest rate	0.00%
First Mortgage Bonds | Maximum
Interest rate	5.50%
Amortizing Secured Notes | Minimum
Interest rate	3.94%
Amortizing Secured Notes | Maximum
Interest rate	7.05%
State Revolving Trust Notes | Minimum
Interest rate	0.00%
State Revolving Trust Notes | Maximum
Interest rate	4.03%
Convertible Preferred Stock $7.00 Series
Cumulative preferred stock, price (in dollars per share)	$ 7.00	$ 7.00
Nonredeemable Preferred Stock $7.00 Series
Cumulative preferred stock, price (in dollars per share)	7.00	7.00
Nonredeemable Preferred Stock $4.75 Series
Cumulative preferred stock, price (in dollars per share)	$ 4.75	$ 4.75

X

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22)(a)(1))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1B
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481139/470-20-50-1B

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X

- Definition

Per share conversion price of preferred stock.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481112/505-10-50-13

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