Income Taxes - Effective Income Tax Rate Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Income Tax Disclosure [Abstract]
Book income before taxes	$ 3,983	$ 7,862
Amount:
Computed federal tax expense at statutory rate	$ 836	$ 1,651
Tax Jurisdiction of Domicile [Extensible Enumeration]	UNITED STATES	UNITED STATES
State income taxes - net of federal tax benefit	$ 158	$ 318
Tax regulatory asset amortization	37	37
Other nontaxable or nondeductible items	18	10
Other differences	(23)	57
Income tax expense	$ 1,026	$ 2,073
Percent:
Computed federal tax expense (benefit) at statutory rate (as a percent)	21.00%	21.00%
State income taxes - net of federal tax benefit (as a percent)	4.00%	4.00%
Tax regulatory amortization (as a percent)	0.90%	0.50%
Other nontaxable or nondeductible items (as a percent)	0.50%	0.10%
Other differences (as a percent)	(0.60%)	0.80%
Income tax expense (as a percent)	25.80%	26.40%