BUSINESS SEGMENT INFORMATION (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2022 USD ($) Segment Subsidiary Business	Dec. 31, 2021 USD ($)	Dec. 31, 2020 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	$ 98,897	$ 90,859	$ 88,141
Segment Reporting, Operating Income [Abstract]
Operating Income	23,906	22,294	22,295
Segment Reporting, Income Taxes [Abstract]
Income Taxes	5,878	5,737	5,684
Segment Reporting, Assets [Abstract]
Assets	719,791	624,715
Intersegment Eliminations [Member]
Segment Reporting, Revenue [Abstract]
Revenues	(169)	(153)	(187)
Regulated Utility [Member]
Segment Reporting, Revenue [Abstract]
Revenues	89,818	85,016	83,001
Segment Reporting, Operating Income [Abstract]
Operating Income	22,580	21,103	21,148
Segment Reporting, Income Taxes [Abstract]
Income Taxes	5,091	5,146	5,093
Segment Reporting, Assets [Abstract]
Assets	713,113	618,751
Other (non-utility) [Member]
Segment Reporting, Revenue [Abstract]
Revenues	9,248	5,996	5,327
Segment Reporting, Operating Income [Abstract]
Operating Income	1,326	1,191	1,147
Segment Reporting, Income Taxes [Abstract]
Income Taxes	787	591	$ 591
Segment Reporting, Assets [Abstract]
Assets	$ 6,678	$ 5,964