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Stock Option Plans (Narrative) (Details) - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock options grants in period 322,000    
Stock option vesting period 4 years    
Granted, weighted average grant date fair value $ 3.34 $ 3.65  
Cash received related to option exercises $ 893,000 $ 146,000  
Option exercises, total intrinsic value 1,200,000 220,000  
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense 260,000 48,000  
Stock-based compensation expense 1,100,000 947,000  
Total fair market value of shares non-option and restricted stock vested 782,000 593,000  
Personnel Expense [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation expense 860,000 781,000  
Other Operating Expense [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation expense $ 215,000 $ 166,000  
Stock Options [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock options grants in period 322,000 279,000  
Options And Restricted Stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unrecognized compensation expense related to non-vested options and restricted stock $ 1,500,000    
Weighted average period 29 months    
2009 Stock Option Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock options grants in period 322,000    
Options exercised 263,250    
Intrinsic value of stock options outstanding and exercisable $ 3,827,808    
2019 Stock Incentive Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Common stock shares authorized under 2009 stock incentive plan     2,500,000
Authorized annual grant of stock options per employee     200,000
Share-based compensation arrangement by share-based payment award, expiration date May 16, 2029    
2019 Stock Incentive Plan [Member] | Non Employee Directors | Maximum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Authorized annual grant of stock options per non-employee 20,000    
2019 Stock Incentive Plan [Member] | Stock Options [Member] | Minimum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Minimum fair value percentage, if participant owns more than 10% voting power 110.00%    
Specified voting power percentage 10.00%    
2019 Stock Incentive Plan [Member] | Nonstatutory Stock Options [Member] | Minimum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Minimum fair value percentage, if participant owns up to 10% voting power 100.00%