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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, 2016
Dec. 31, 2015
Dec. 31, 2014
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 $ 1,012 $ 1,152 $ 580    
Total unrecognized stock-based compensation expense 537        
Net proceeds under equity grants $ (105) $ 79 $ (47)    
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 11 months 9 days        
Weighted average remaining life of grants that are exercisable 3 years 10 months 2 days        
Stock option and SOSAR grants exercised (in shares) 1,000        
Stock Only Stock Appreciation Rights (SOSARS) | First anniversary          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting percentage of awards 33.33%        
Stock Only Stock Appreciation Rights (SOSARS) | Second anniversary          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting percentage of awards 33.33%        
Stock Only Stock Appreciation Rights (SOSARS) | Third anniversary          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting percentage of awards 33.33%        
Restricted stock          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Grants approved by the Board of Directors (in shares) 83,000 74,000      
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) 380,000