DEBT, Long-Term Debt (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Long-term debt consists of [Abstract]
Long term debt	$ 178,676	$ 180,542
Less: current maturities (principal amount)	2,167	2,235
Total long-term debt	176,509	178,307
Payments of principal amounts due during the next five years and thereafter [Abstract]
2024	2,167
2025	2,235
2026	2,282
2027	27,016
2028	2,068
Thereafter	142,908
Asset Purchase-Contractual Obligation [Member]
Payments of principal amounts due during the next five years and thereafter [Abstract]
2024	314
2025	314
2026	314
2027	0
2028	0
Thereafter	0
First Mortgage Bonds [Member]
Long-term debt consists of [Abstract]
Long term debt	155,400	156,000
Payments of principal amounts due during the next five years and thereafter [Abstract]
2024	600
2025	600
2026	600
2027	25,600
2028	600
Thereafter	127,400
First Mortgage Bonds [Member] | Series R [Member]
Long-term debt consists of [Abstract]
Long term debt	$ 25,000	25,000
Interest rate, stated percentage	5.96%
Maturity date	Dec. 31, 2028
First Mortgage Bonds [Member] | Series S [Member]
Long-term debt consists of [Abstract]
Long term debt	$ 5,400	6,000
Interest rate, stated percentage	4.45%
Maturity date	Dec. 31, 2033
First Mortgage Bonds [Member] | Series T [Member]
Long-term debt consists of [Abstract]
Long term debt	$ 40,000	40,000
Interest rate, stated percentage	4.24%
Maturity date	Dec. 20, 2036
First Mortgage Bonds [Member] | Series U [Member]
Long-term debt consists of [Abstract]
Long term debt	$ 25,000	25,000
Interest rate, stated percentage	4.71%
Maturity date	Jan. 31, 2038
First Mortgage Bonds [Member] | Series V [Member]
Long-term debt consists of [Abstract]
Long term debt	$ 30,000	30,000
Interest rate, stated percentage	4.42%
Maturity date	Oct. 31, 2049
First Mortgage Bonds [Member] | Series W [Member]
Long-term debt consists of [Abstract]
Long term debt	$ 30,000	30,000
Interest rate, stated percentage	4.43%
Maturity date	Apr. 30, 2047
State Revolving Fund Loans [Member]
Long-term debt consists of [Abstract]
Long term debt	$ 12,744	13,132
Payments of principal amounts due during the next five years and thereafter [Abstract]
2024	773
2025	816
2026	836
2027	857
2028	878
Thereafter	8,584
State Revolving Fund Loans [Member] | 3.57%, due 09/01/2023 [Member]
Long-term debt consists of [Abstract]
Long term debt	$ 0	0
Interest rate, stated percentage	3.57%
Maturity date	Sep. 01, 2023
State Revolving Fund Loans [Member] | 3.64%, due 05/01/2025 [Member]
Long-term debt consists of [Abstract]
Long term debt	$ 77	228
Interest rate, stated percentage	3.64%
Maturity date	May 01, 2025
State Revolving Fund Loans [Member] | 3.41%, due 02/01/2031 [Member]
Long-term debt consists of [Abstract]
Long term debt	$ 1,246	1,415
Interest rate, stated percentage	3.41%
Maturity date	Feb. 01, 2031
State Revolving Fund Loans [Member] | 3.40%, due 07/01/2032 [Member]
Long-term debt consists of [Abstract]
Long term debt	$ 1,296	1,445
Interest rate, stated percentage	3.40%
Maturity date	Jul. 01, 2032
State Revolving Fund Loans [Member] | 1.187% due 11/01/2041 [Member]
Long-term debt consists of [Abstract]
Long term debt	$ 559	588
Interest rate, stated percentage	1.187%
Maturity date	Nov. 01, 2041
State Revolving Fund Loans [Member] | 1.187% due 11/01/2041 [Member]
Long-term debt consists of [Abstract]
Long term debt	$ 655	690
Interest rate, stated percentage	1.187%
Maturity date	Nov. 01, 2041
State Revolving Fund Loans [Member] | 1.187% due 11/01/2041 [Member]
Long-term debt consists of [Abstract]
Long term debt	$ 1,021	1,075
Interest rate, stated percentage	1.187%
Maturity date	Nov. 01, 2041
State Revolving Fund Loans [Member] | 2.00% Due 02/01/2043 [Member]
Long-term debt consists of [Abstract]
Long term debt	$ 793	828
Interest rate, stated percentage	2.00%
Maturity date	Feb. 01, 2043
State Revolving Fund Loans [Member] | 2.00% Due 02/01/2043 [Member]
Long-term debt consists of [Abstract]
Long term debt	$ 1,095	1,143
Interest rate, stated percentage	2.00%
Maturity date	Feb. 01, 2043
State Revolving Fund Loans [Member] | 2.00% Due 06/01/2043 [Member]
Long-term debt consists of [Abstract]
Long term debt	$ 960	1,002
Interest rate, stated percentage	2.00%
Maturity date	Jun. 01, 2043
State Revolving Fund Loans [Member] | 2.00% Due 06/01/2043 [Member]
Long-term debt consists of [Abstract]
Long term debt	$ 978	1,022
Interest rate, stated percentage	2.00%
Maturity date	Jun. 01, 2043
State Revolving Fund Loans [Member] | 2.00% Due 02/01/2044 [Member]
Long-term debt consists of [Abstract]
Long term debt	$ 3,086	2,696
Interest rate, stated percentage	2.00%
Maturity date	Feb. 01, 2044
State Revolving Fund Loans [Member] | 2.00% Due 01/01/2043 [Member]
Long-term debt consists of [Abstract]
Long term debt	$ 978	1,000
Interest rate, stated percentage	2.00%
Maturity date	Jan. 01, 2043
State Revolving Fund Loans [Member] | Promissory Note [Member]
Payments of principal amounts due during the next five years and thereafter [Abstract]
2024	$ 480
2025	505
2026	532
2027	559
2028	590
Thereafter	6,924
Notes Payable [Member]
Long-term debt consists of [Abstract]
Long term debt	10,532	11,410
Notes Payable [Member] | Promissory Note [Member]
Long-term debt consists of [Abstract]
Long term debt	$ 9,590	10,155
Interest rate, stated percentage	5.12%
Maturity date	Dec. 30, 2028
Notes Payable [Member] | Asset Purchase-Contractual Obligation [Member]
Long-term debt consists of [Abstract]
Long term debt	$ 942	$ 1,255
Interest rate, stated percentage	2.00%
Maturity date	May 26, 2027