Income Taxes - Reconciliation of liability for uncertain tax positions (Details) - USD ($)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Income Taxes
Liability for uncertain tax positions, beginning balance	$ 42,000	$ 53,000
Decrease due to state tax expense	(8,000)	(16,000)
Increases due to interest and state tax	1,000	5,000
Liability for uncertain tax positions, ending balance	$ 35,000	$ 42,000