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Earnings per share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Basis earnings per share:    
Net income attributable to Common shareholders $ (699) $ 800
Divided by:    
Weighted average shares outstanding (in shares) 3,965,186 3,956,492
Basic earnings per common share (usd per share) $ (0.18) $ 0.20
Diluted earnings per share:    
Net income attributable to Common shareholders $ (699) $ 800
Weighted average shares outstanding (in shares) 3,965,186 3,956,492
Effect of potentially dilutive restricted common shares (in shares) 0 9,510
Divided by:    
Weighted average diluted shares outstanding (in shares) 3,965,186 3,966,002
Diluted earnings (loss) per share (usd per share) $ (0.18) $ 0.20
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Effect of potentially dilutive restricted common shares (in shares) 0 9,510
Restricted Stock    
Diluted earnings per share:    
Effect of potentially dilutive restricted common shares (in shares) 491  
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Effect of potentially dilutive restricted common shares (in shares) 491