BUSINESS SEGMENT INFORMATION (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024 USD ($)	Jun. 30, 2023 USD ($)	Jun. 30, 2024 USD ($) Segment Subsidiary Business	Jun. 30, 2023 USD ($)	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	$ 27,416	$ 25,251	$ 51,960	$ 47,746
Segment Reporting, Operating Income [Abstract]
Operating Income	7,198	6,208	11,917	10,269
Segment Reporting, Income Taxes [Abstract]
Income Taxes	1,945	1,593	3,627	2,906
Segment Reporting, Assets [Abstract]
Assets	783,131	766,832	783,131	766,832	$ 766,832
Intersegment Eliminations [Member]
Segment Reporting, Revenue [Abstract]
Revenues	(58)	(54)	(118)	(108)
Regulated Utility [Member] | Operating Segments [Member]
Segment Reporting, Revenue [Abstract]
Revenues	25,789	23,668	48,630	44,501
Segment Reporting, Operating Income [Abstract]
Operating Income	6,907	6,013	11,265	9,717
Segment Reporting, Income Taxes [Abstract]
Income Taxes	1,725	1,303	3,151	2,370
Segment Reporting, Assets [Abstract]
Assets	773,350	760,339	773,350	760,339
Other (non-utility) [Member] | Operating Segments [Member]
Segment Reporting, Revenue [Abstract]
Revenues	1,685	1,637	3,448	3,353
Segment Reporting, Operating Income [Abstract]
Operating Income	291	195	652	552
Segment Reporting, Income Taxes [Abstract]
Income Taxes	220	290	476	536
Segment Reporting, Assets [Abstract]
Assets	$ 9,781	$ 6,493	$ 9,781	$ 6,493