Shareholders' Equity - Calculation of earning per share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Shareholders' Equity
Net income	$ 325	$ 541
Weighted average common shares outstanding (basic) (in shares)	2,432	2,404
Unvested restricted stock (in shares)	3	3
Weighted average common shares outstanding (diluted) (in shares)	2,435	2,407
Basic
Net income per share	$ 0.13	$ 0.23
Diluted
Net income per share	$ 0.13	$ 0.22