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Summary of changes in restricted stock awards (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Sep. 30, 2021
Dec. 31, 2020
Restricted Stock [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Restricted stock     48,298 20,520
Restricted stock     $ 45.87 $ 46.30
Restricted stock     3 years 3 months 19 days 3 years 4 months 25 days
Restricted stock     $ 2,215 $ 950
Time Based Awards Granted [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Restricted stock 8,896   8,896  
Restricted stock     $ 45.55  
Restricted stock     $ 405  
Performance Based Awards Granted [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Restricted stock 18,882 20,520 18,882  
Restricted stock     $ 45.55  
Restricted stock     $ 860