Summary of Significant Accounting Policies - Basic and diluted earnings per share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Numerator:
Net loss	$ (1,575)	$ (1,577)
Less: Loss allocated to unvested participating securities	(73)	(50)
Net loss available to common shareholders	$ (1,502)	$ (1,527)
Denominator:
Denominator for basic earnings per share - weighted average shares	6,123,000	6,063,000
Effect of dilutive securities:
Common stock equivalents	0	0
Denominator for diluted earnings per share - adjusted weighted-average shares and assumed conversions	6,123,000	6,063,000
Loss per share:
Basic (in dollars per share)	$ (0.25)	$ (0.25)
Diluted (in dollars per share)	$ (0.25)	$ (0.25)
Antidilutive securities excluded from computation of earnings per share, amount	0	0