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Stock-Based Compensation (Restricted Stock Narrative) (Details) - Restricted Stock - USD ($)
$ in Thousands
12 Months Ended
Mar. 23, 2017
Feb. 14, 2017
Jun. 18, 2014
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Granted (in shares)       140,988 126,432 139,451
Share-based compensation expense       $ 2,226 $ 3,675 $ 1,793
Total unrecognized compensation expense       $ 2,620    
Unrecognized compensation cost related to stock options, weighted average period for recognition       3 years 3 months    
Chief Executive Officer            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Granted (in shares)   84,700        
Award vesting period   3 years        
Chief Financial Officer            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Granted (in shares) 20,000          
Vice President of Technical Services            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Granted (in shares) 20,000          
Executive Officer            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Award vesting period 3 years          
Director            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Granted (in shares)       16,288    
Award vesting period       1 year    
2009 Restricted Stock/Units Plan            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Additional shares authorized (in shares)     500,000      
Number of shares authorized (in shares)     800,000      
Share-based compensation arrangement by share-based payment award, equity instruments other than options, nonvested (in shares)       45,533