Income Taxes - Reconciliation of income tax (Details) - USD ($)	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Reconciliation of income tax amount
Tax expense (benefit) at U.S. statutory rates	$ (2,198,000)	$ 960,000
Tax Jurisdiction of Domicile [Extensible Enumeration]	country:US	country:US
State tax expense, net of federal benefit	$ (498,000)	$ 270,000
Effective Income Tax Rate Reconciliation, State and Local Jurisdiction, Contribution Greater than 50 Percent, Tax Effect [Extensible Enumeration]	stpr:MA, stpr:VA, stpr:WI	stpr:MA, stpr:NH, stpr:VA, stpr:WI
Tax expense on deficit from restricted stock vesting	$ 156,000	$ 167,000
Tax benefit from dividends paid on restricted stock	(57,000)	(144,000)
Other nontaxable and nondeductible items, net	59,000	(134,000)
Other adjustments	(32,000)	(9,000)
Total income tax provision	$ (2,570,000)	$ 1,110,000
Reconciliation of income tax percent
Tax expense (benefit) at U.S. statutory rates percent	21.00%	21.00%
State tax expense (benefit), net of federal benefit percent	4.80%	5.90%
Tax expense on deficit from restricted stock vesting percent	(1.50%)	3.70%
Tax benefit from dividends paid on restricted stock percent	0.50%	(3.20%)
Other nontaxable and nondeductible items, net percent	(0.60%)	(2.90%)
Other adjustments percent	0.30%	(0.20%)
Effective Income Tax Rate, Percent	24.50%	24.30%