Revenue Recognition - Operating Revenues Disaggregated by Service and Customer Type (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Revenue Recognition [Abstract]
Revenue from contracts with customers	$ 23,408	$ 19,083	$ 43,382	$ 37,425
Rents from regulated property	107	116	207	230
Total operating revenue	23,515	19,199	43,589	37,655
Water Utility Service [Member] \| Residential [Member]
Revenue Recognition [Abstract]
Revenue from contracts with customers	12,727	10,626	23,677	20,876
Water Utility Service [Member] \| Commercial and Industrial [Member]
Revenue Recognition [Abstract]
Revenue from contracts with customers	6,553	5,214	11,863	10,150
Water Utility Service [Member] \| Fire Protection [Member]
Revenue Recognition [Abstract]
Revenue from contracts with customers	1,371	1,214	2,664	2,404
Wastewater Utility Service [Member] \| Residential [Member]
Revenue Recognition [Abstract]
Revenue from contracts with customers	2,274	1,614	4,105	3,196
Wastewater Utility Service [Member] \| Commercial and Industrial [Member]
Revenue Recognition [Abstract]
Revenue from contracts with customers	385	349	933	694
Billing and Revenue Collection Services [Member]
Revenue Recognition [Abstract]
Revenue from contracts with customers	20	17	39	43
Collection Services [Member]
Revenue Recognition [Abstract]
Revenue from contracts with customers	21	30	25	33
Other Revenue [Member]
Revenue Recognition [Abstract]
Revenue from contracts with customers	$ 57	$ 19	$ 76	$ 29