BUSINESS SEGMENT INFORMATION (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2024 USD ($) Subsidiary Business Segment	Mar. 31, 2023 USD ($)	Dec. 31, 2023 USD ($)
BUSINESS SEGMENT INFORMATION [Abstract]
Number of reportable segments | Segment	1
Number of regulated utility subsidiaries | Subsidiary	5
Number of non-utility businesses | Business	1
Segment Reporting, Revenue [Abstract]
Revenues	$ 24,544	$ 22,495
Segment Reporting, Operating Income [Abstract]
Operating Income	4,719	4,060
Segment Reporting, Income Taxes [Abstract]
Income Taxes	1,681	1,313
Segment Reporting, Assets [Abstract]
Assets	775,411	766,832	$ 766,832
Intersegment Eliminations [Member]
Segment Reporting, Revenue [Abstract]
Revenues	(59)	(53)
Regulated Utility [Member] | Operating Segments [Member]
Segment Reporting, Revenue [Abstract]
Revenues	22,840	20,832
Segment Reporting, Operating Income [Abstract]
Operating Income	4,357	3,705
Segment Reporting, Income Taxes [Abstract]
Income Taxes	1,425	1,066
Segment Reporting, Assets [Abstract]
Assets	762,084	760,339
Other (non-utility) [Member] | Operating Segments [Member]
Segment Reporting, Revenue [Abstract]
Revenues	1,763	1,716
Segment Reporting, Operating Income [Abstract]
Operating Income	362	355
Segment Reporting, Income Taxes [Abstract]
Income Taxes	256	247
Segment Reporting, Assets [Abstract]
Assets	$ 13,327	$ 6,493