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Stock-Based Compensation (Narrative) (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2017
USD ($)
ShareBasedCompensationPlan
shares
Dec. 31, 2016
USD ($)
shares
Dec. 31, 2015
USD ($)
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of stock-based compensation plans | ShareBasedCompensationPlan 2    
Shares issued in Employee Stock Purchase Plan | shares 7,610 10,596 10,574
Employee [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation, cost recognized $ 456 $ 380 $ 318
Director [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation, cost recognized $ 120 $ 98 $ 106
Stock Options [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Purchase price of stock as a percentage of it's fair market value 100.00%    
Unrecognized cost related to options $ 220    
Expected term 6 years 11 months 12 days 6 years 9 months 7 days 6 years 4 months 10 days
Stock Options [Member] | Maximum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period 4 years    
Expected term 10 years    
Stock Options [Member] | Minimum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period 12 months    
Restricted Stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unrecognized cost related to restricted share-based compensation arrangements $ 756    
2009 Long-Term Equity Incentive Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares authorized | shares 629,796    
Number of shares available for grant | shares 107,824    
Employee Stock Purchase Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation, cost recognized $ 47 $ 75 $ 71
Number of shares available for grant | shares 114,944    
Purchase price of stock as a percentage on grant or exercise date 85.00%    
Expected term   6 months 6 months
Maximum employee subscription rate 15.00%