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Subsequent Events (Details) - Subsequent events - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Mar. 09, 2020
Mar. 03, 2020
Nov. 30, 2021
2009 Stock Option Plan      
Subsequent events      
Granted (in shares)   48,000 50,000
Exercise price (in dollars per share)   $ 45.98  
2020 Incentive Award Plan      
Subsequent events      
Granted (in shares)   52,000  
Exercise price (in dollars per share) $ 46.91 $ 46.91  
Exercise of stock options (shares) 53,293    
Proceeds from exercise of stock options $ 2,500