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Shareholders' Equity - Calculation of earning per share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Shareholders' Equity    
Net income $ 4,055 $ 100
Weighted average common shares outstanding (basic) (in shares) 2,411 2,366
Unvested restricted stock (in shares) 7 31
Weighted average common shares outstanding (diluted) (in shares) 2,418 2,397
Basic    
Net income per share $ 1.68 $ 0.04
Diluted    
Net income per share $ 1.68 $ 0.04