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Summary of Significant Accounting Policies (Computation of Basic and Diluted Common Shares) (Details) - shares
shares in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Summary Of Significant Accounting Policies [Line Items]        
Weighted average number of shares outstanding for basic per share calculation 15,854 15,738 15,833 15,716
Effect of dilutive potential shares:        
Adjusted weighted average shares outstanding for diluted per share 16,131 16,043 16,113 16,063
Stock Options [Member]        
Effect of dilutive potential shares:        
Effect of dilutive potential shares 241 285 237 298
Anti-dilutive shares:        
Anti-dilutive shares 111 73 111 73
Restricted Stock Awards [Member]        
Effect of dilutive potential shares:        
Effect of dilutive potential shares 36 20 43 49
Anti-dilutive shares:        
Anti-dilutive shares 81 127 19 75