BUSINESS SEGMENT INFORMATION (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2024 USD ($) Segment Business Subsidiary	Sep. 30, 2023 USD ($)	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	$ 29,142	$ 26,570	$ 81,102	$ 74,317
Segment Reporting, Operating Income [Abstract]
Operating Income	8,590	6,661	20,508	16,932
Segment Reporting, Income Taxes [Abstract]
Income Taxes	2,355	2,249	5,982	5,156
Segment Reporting, Assets [Abstract]
Assets	796,020	766,832	796,020	766,832	$ 766,832
Intersegment Eliminations [Member]
Segment Reporting, Revenue [Abstract]
Revenues	(59)	(54)	(176)	(161)
Regulated Utility [Member] | Operating Segments [Member]
Segment Reporting, Revenue [Abstract]
Revenues	27,450	24,877	76,080	69,377
Segment Reporting, Operating Income [Abstract]
Operating Income	8,289	6,387	19,555	16,104
Segment Reporting, Income Taxes [Abstract]
Income Taxes	2,147	1,929	5,298	4,300
Segment Reporting, Assets [Abstract]
Assets	781,225	760,339	781,225	760,339
Other (non-utility) [Member] | Operating Segments [Member]
Segment Reporting, Revenue [Abstract]
Revenues	1,751	1,747	5,198	5,101
Segment Reporting, Operating Income [Abstract]
Operating Income	301	274	953	828
Segment Reporting, Income Taxes [Abstract]
Income Taxes	208	320	684	856
Segment Reporting, Assets [Abstract]
Assets	$ 14,795	$ 6,493	$ 14,795	$ 6,493