BUSINESS SEGMENT INFORMATION (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2023 USD ($) Segment Subsidiary Business	Mar. 31, 2022 USD ($)	Dec. 31, 2022 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	$ 22,495	$ 22,187
Segment Reporting, Operating Income [Abstract]
Operating Income	4,060	4,743
Segment Reporting, Income Taxes [Abstract]
Income Taxes	1,313	1,419
Segment Reporting, Assets [Abstract]
Assets	725,786	719,791	$ 719,791
Intersegment Eliminations [Member]
Segment Reporting, Revenue [Abstract]
Revenues	(53)	(33)
Regulated Utility [Member] | Operating Segments [Member]
Segment Reporting, Revenue [Abstract]
Revenues	20,832	20,668
Segment Reporting, Operating Income [Abstract]
Operating Income	3,705	4,338
Segment Reporting, Income Taxes [Abstract]
Income Taxes	1,066	1,243
Segment Reporting, Assets [Abstract]
Assets	721,564	713,113
Other (non-utility) [Member] | Operating Segments [Member]
Segment Reporting, Revenue [Abstract]
Revenues	1,716	1,552
Segment Reporting, Operating Income [Abstract]
Operating Income	355	405
Segment Reporting, Income Taxes [Abstract]
Income Taxes	247	176
Segment Reporting, Assets [Abstract]
Assets	$ 4,222	$ 6,678