Summary of Significant Accounting Policies - Basic and diluted earnings per share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2025	Mar. 31, 2025	Jun. 30, 2024	Mar. 31, 2024	Jun. 30, 2025	Jun. 30, 2024
Numerator:
Net income (loss)	$ 1,128	$ (1,575)	$ 2,501	$ (1,577)	$ (447)	$ 924
Less: Income (loss) allocated to unvested participating securities	47		78		(21)	29
Net income (loss) available to common shareholders	$ 1,081		$ 2,423		$ (426)	$ 895
Denominator:
Denominator for basic earnings per share - weighted average shares	6,176,000		6,072,000		6,138,000	6,068,000
Effect of dilutive securities:
Common stock equivalents	0		0		0	0
Denominator for diluted earnings per share - adjusted weighted-average shares and assumed conversions	6,176,000		6,072,000		6,138,000	6,068,000
Income (loss) per share:
Basic (in dollars per share)	$ 0.18		$ 0.4		$ (0.07)	$ 0.15
Diluted (in dollars per share)	$ 0.18		$ 0.4		$ (0.07)	$ 0.15
Anti-dilutive securities excluded from computation of earnings per share, amount	0		0		0	0