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Stock Plans (Schedule of SSARs Activity) (Details) - Stock-Settled Stock Appreciation Rights (SSARs) [Member] - $ / shares
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Outstanding December 31, 97,264 89,250 53,360  
Granted 11,073 38,941  
Exercised 0 (3,059) (3,051)  
Forfeited  
Outstanding December 31, 97,264 97,264 89,250 53,360
Weighted-average grant date fair value, Outstanding December 31, $ 9.47 $ 8.36 $ 4.20  
Weighted-average grant date fair value - Granted 16.79 13.73  
Weighted-average grant date fair value - Exercised 3.48 4.03  
Weighted-average grant date fair value - Forfeited  
Weighted-average grant date fair value, Outstanding December 31, $ 9.47 $ 9.47 $ 8.36 $ 4.20
Weighted-average remaining contractual term (years), Granted   10 years 10 years  
Weighted-average remaining contractual term (years), Outstanding 6 years 6 months 7 years 6 months 8 years 2 months 12 days 8 years 6 months
Vested and exercisable 76,897      
Vesting period 3 years      
Share-based Compensation Award, Tranche One, Two and Three [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period, percentage per year 33.00%