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Shareholders' Equity, Stock Plans and Preferred Stock (Shareholders' Equity and Stock Plans) (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
May 31, 2017
Jun. 30, 2016
Jun. 29, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Shares authorized under the Plan (in shares)         350,000 150,000
Stock based compensation $ 1,027 $ 1,012 $ 1,152      
Total unrecognized stock-based compensation expense 593          
Net proceeds under equity grants $ (94) $ (105) $ 79      
Stock Options and Stock Appreciation Rights (SARs)            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Weighted average remaining life of outstanding equity grants 3 years 3 months          
Weighted average remaining life of grants that are exercisable 3 years 3 months          
Stock option and SOSAR grants exercised (in shares) 1,000          
Restricted stock            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Grants approved by the Board of Directors (in shares) 88,000 83,000        
Restricted stock | First anniversary            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting percentage of awards 33.33%          
Restricted stock | Second anniversary            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting percentage of awards 33.33%          
Restricted stock | Third anniversary            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting percentage of awards 33.33%          
2005 Long Term Incentive Plan            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Common stock reserved for future issuance (in shares) 700,000          
Maximum term of option 10 years          
2008 Stock Purchase Plan            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Common stock reserved for future issuance (in shares) 150,000          
Percentage of fair market value at date of grant (percentage) 85.00%          
Restriction period 2 years          
2010 Long Term Incentive Plan            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Common stock reserved for future issuance (in shares) 680,000     380,000