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Share-Based Compensation (Narrative) (Details)
1 Months Ended 3 Months Ended 12 Months Ended
Feb. 28, 2017
USD ($)
Jan. 01, 2008
Feb. 28, 2018
executive
shares
Mar. 31, 2017
USD ($)
shares
Mar. 31, 2017
USD ($)
Dec. 31, 2019
USD ($)
shares
Dec. 31, 2018
USD ($)
shares
Dec. 31, 2017
USD ($)
shares
Dec. 31, 2016
shares
Feb. 28, 2015
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Number of options outstanding (in shares)           67,500 99,500      
Vesting term           4 years        
Options forfeited     10,000     10,000        
Intrinsic value of stock options exercised | $         $ 42,000 $ 217,064   $ 371,000    
Total fair value of stock options vested | $           $ 141,584 $ 0 $ 142,000    
Share-based Compensation Arrangement by Share-based Payment Award, Award Performance Period           3 years        
Restricted Stock And Restricted Stock Unit [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
RSU available for issuance (in share)           0 75,250 169,000 271,000  
Granted, shares (in shares)           0 0 0    
RSUs vested during period (in shares)           0 0 82,000    
Restricted Stock [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Equity instruments other than options, vested in period, fair value | $       $ 3,600,000            
RSUs vested during period (in shares)       61,445            
2015 Plan [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Number of shares authorized (in shares)                   4,900,000
Options granted during period               0    
Compensation expense not yet recognized | $           $ 300,000        
Compensation expense not yet recognized, period for recognition           2 years 1 month 6 days        
2015 Plan [Member] | Employee Stock Option [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Number of options available for issuance (in shares)           80,000        
Number of executives | executive     4              
2005 Plan [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Percentage of stock option exercisable per year           25.00%        
Stock option expiration period (in years)   10 years                
Common Stock [Member] | 2015 Plan [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Number of options outstanding (in shares)           70,000        
Number of shares available for issuance (in shares)           4,830,000        
Additional Paid-in Capital [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Reclassification of restricted stock units from equity to liability award | $ $ 200,000             $ 3,400,000