Shareholders' Equity - Calculation of earning per share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Shareholders' Equity
Net income	$ 100	$ 2,447
Weighted average common shares outstanding (basic) (in shares)	2,366	2,330
Unvested restricted stock (in shares)	31	56
Weighted average common shares outstanding (diluted) (in shares)	2,397	2,386
Basic
Net income per share	$ 0.04	$ 1.05
Diluted
Net income per share	$ 0.04	$ 1.03