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Stock-Based Compensation (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
May 03, 2019
May 04, 2018
May 07, 2015
May 31, 2012
Nonemployee director annual stock grants     25,000          
Document Period End Date     Jun. 30, 2019          
Share-based Payment Arrangement, Expense $ 477 $ 368 $ 2,478 $ 1,794        
Unrecognized compensation cost $ 1,821   $ 1,821          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value     $ 6.17 $ 4.49        
2012 Plan [Member]                
Shares available for grants 319,669   319,669     3,500,000 3,000,000 1,500,000
Stock Option Plan, Award Vesting Period     5 years          
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period     10 years          
Prior To Shareholder Approval of Increase [Member]                
Nonemployee director annual stock grants     15,000          
Prior To Shareholder Approval of Second Amendment [Member]                
Nonemployee director annual stock grants     20,000          
2019 Plan [Member]                
Shares available for grants         3,000,000      
Stock Option Plan, Award Vesting Period     5 years          
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period     10 years          
Expected To Be Recognized During 2019 [Member]                
Unrecognized compensation cost $ 953   $ 953          
Expected To Be Recognized During 2020 [Member]                
Unrecognized compensation cost 776   776          
Expected To Be Recognized During 2021 [Member]                
Unrecognized compensation cost $ 92   $ 92