Summary of Significant Accounting Policies - Basic and diluted earnings per share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Numerator:
Net (loss) income	$ (1,577)	$ 920
Less: Income (loss) allocated to unvested participating securities	(50)	14
Net (loss) income available to common shareholders	$ (1,527)	$ 906
Denominator:
Denominator for basic earnings per share - weighted average shares	6,063,000	6,028,000
Effect of dilutive securities:
Common stock equivalents	0	0
Denominator for diluted earnings per share - adjusted weighted-average shares and assumed conversions	6,063,000	6,028,000
Earnings (loss) per share:
Basic (in dollars per share)	$ (0.25)	$ 0.15
Diluted earnings (loss) per share:
Diluted (in dollars per share)	$ (0.25)	$ 0.15
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	0	0