Summary of Significant Accounting Policies - Basic and diluted earnings per share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2024	Sep. 30, 2023
Numerator:
Net income	$ 1,267	$ 2,501	$ (1,577)	$ 2,729	$ 3,350	$ 920	$ 2,191	$ 6,999
Less: Income allocated to unvested participating securities	39			41			69	105
Net income available to common shareholders	$ 1,228			$ 2,688			$ 2,122	$ 6,894
Denominator:
Denominator for basic earnings per share - weighted average shares	6,075,000			6,032,000			6,070,000	6,031,000
Effect of dilutive securities:
Common stock equivalents	0			0			0	0
Denominator for diluted earnings per share - adjusted weighted-average shares and assumed conversions	6,075,000			6,032,000			6,070,000	6,031,000
Earnings per share:
Basic (in dollars per share)	$ 0.20			$ 0.45			$ 0.35	$ 1.15
Diluted earnings (loss) per share:
Diluted (in dollars per share)	$ 0.20			$ 0.45			$ 0.35	$ 1.15
Antidilutive securities excluded from computation of earnings per share, amount	0			0			0	0