Shareholders' Equity - Calculation of earning per share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2022	Sep. 30, 2021
Shareholders' Equity
Number of shares that could potentially dilute basic earnings per share in the future	15,299			9,868			15,299	9,868
Net (loss)/income	$ (316)	$ (810)	$ 325	$ 3,238	$ 1,186	$ 541	$ (801)	$ 4,965
Weighted average common shares outstanding (basic)	2,427,000			2,410,000			2,424,000	2,404,000
Unvested restricted stock	0			10,000			0	10,000
Weighted average common shares outstanding (diluted)	2,427,000			2,420,000			2,424,000	2,414,000
Basic
Net (loss)/income per share	$ (0.13)			$ 1.34			$ (0.33)	$ 2.07
Diluted
Net (loss)/income per share	$ (0.13)			$ 1.34			$ (0.33)	$ 2.06