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Stock-Based Compensation (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Apr. 30, 2017
Jun. 30, 2016
Jun. 29, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Shares authorized under the plan (shares)         350,000 150,000
Share-based compensation expense $ 241 $ 252        
Restricted Stock            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Grant of restricted common stock (shares) 88,000 83,000        
Restricted Stock | First anniversary of grant date            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting percentage of awards 33.00%          
Restricted Stock | Second anniversary of grant date            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting percentage of awards 33.00%          
Restricted Stock | Third anniversary of grant date            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting percentage of awards 33.00%          
Stock Options and Stock Appreciation Rights (SARs)            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Payment award, expiration period 10 years          
SOSARs granted in period (shares) 0   0      
Stock Options and Stock Appreciation Rights (SARs) | First anniversary of grant date            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting percentage of awards 33.00%          
Stock Options and Stock Appreciation Rights (SARs) | Second anniversary of grant date            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting percentage of awards 33.00%          
Stock Options and Stock Appreciation Rights (SARs) | Third anniversary of grant date            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting percentage of awards 33.00%          
2005 Long Term Incentive Plan            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Shares reserved for future issuance (shares) 700,000          
Expiration period 10 years          
2008 Stock Purchase Plan            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Shares reserved for future issuance (shares) 150,000          
Percentage of quoted market price offering rate 85.00%          
Restriction period 2 years          
2010 Long Term Incentive Plan            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Shares reserved for future issuance (shares) 380,000          
Subsequent event | 2010 Long Term Incentive Plan            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Shares reserved for future issuance (shares)       680,000