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Shareholders' Equity And Stock-Based Compensation (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Aggregate number of shares of common stock for which awards can be granted 189,000   189,000   404,000
Weighted average fair value of options granted $ 7.05   $ 7.36 $ 7.14  
Estimated forfeiture rate of stock options     0.00%    
Weighted average remaining contractual life of options exercisable, years     4 years 7 days    
Stock option expense $ 209 $ 159 $ 634 $ 506  
Unrecognized compensation costs related to non-vested awards $ 1,198   $ 1,198    
Unrecognized compensation costs related to non-vested awards, recognition period     1 year 11 months 12 days    
Proceeds from equity offering, net of offering costs       $ 3,678  
2006 Equity Incentive Plan [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Aggregate number of shares of common stock for which awards can be granted 1,084,000   1,084,000    
2006 & 2015 Equity Incentive Plans [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period of options under equity incentive plan     3 years    
Management Purchase Program [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares purchased for award 0 0 0 0  
Director Purchase Program [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares purchased for award 0 0 0 0  
Employee Stock Purchase Plan [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares purchased for award 3,000 5,000 10,000 14,000  
Maximum [Member] | 2006 & 2015 Equity Incentive Plans [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Term of options     10 years    
Maximum [Member] | Employee Stock Purchase Plan [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Maximum number of shares approved under purchase plan 300,000   300,000