BUSINESS SEGMENT INFORMATION (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2023 USD ($) Segment Business Subsidiary	Dec. 31, 2022 USD ($)	Dec. 31, 2021 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	$ 98,861	$ 98,897	$ 90,859
Segment Reporting, Operating Income [Abstract]
Operating Income	22,446	23,906	22,294
Segment Reporting, Income Taxes [Abstract]
Income Taxes	6,348	5,878	5,737
Segment Reporting, Assets [Abstract]
Assets	766,832	719,791
Intersegment Eliminations [Member]
Segment Reporting, Revenue [Abstract]
Revenues	(244)	(169)	(153)
Regulated Utility [Member] | Operating Segments [Member]
Segment Reporting, Revenue [Abstract]
Revenues	92,228	89,818	85,016
Segment Reporting, Operating Income [Abstract]
Operating Income	21,246	22,411	20,950
Segment Reporting, Income Taxes [Abstract]
Income Taxes	5,216	5,091	5,146
Segment Reporting, Assets [Abstract]
Assets	760,339	713,113
Other (non-utility) [Member] | Operating Segments [Member]
Segment Reporting, Revenue [Abstract]
Revenues	6,877	9,248	5,996
Segment Reporting, Operating Income [Abstract]
Operating Income	1,200	1,495	1,344
Segment Reporting, Income Taxes [Abstract]
Income Taxes	1,132	787	$ 591
Segment Reporting, Assets [Abstract]
Assets	$ 6,493	$ 6,678