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Stock Based Compensation - Restricted stock (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Restricted Stock        
Number of Units        
Number of restricted stock awards granted 29,955      
Number of units, vested 0 0 0  
Unvested restricted stock units outstanding 29,955      
Weighted Average Grant Date Fair Value        
Weighted average grant date fair value, granted (in dollars per share) $ 48.04      
Unrecognized compensation cost $ 1.1      
Recognition period 3 years 2 months 12 days      
Director        
Number of Units        
Stock issued for director's fees 0 0 0  
Director | Restricted Stock        
Number of Units        
Number of restricted stock awards granted       5,708
Number of units, vested     5,708  
Weighted Average Grant Date Fair Value        
Weighted average grant date fair value, granted (in dollars per share)       $ 17.52
Fair value of stock units that vested during period     $ 0.1