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Stockholders' Equity (Narrative) (Details)
3 Months Ended 12 Months Ended
Feb. 20, 2019
Mar. 01, 2018
USD ($)
$ / shares
Mar. 01, 2017
USD ($)
$ / shares
Mar. 31, 2019
USD ($)
director
$ / shares
shares
Mar. 31, 2018
USD ($)
$ / shares
shares
Dec. 31, 2018
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Share Based Compensation Arrangement By Share Based Payment Award, Options, Aggregate Grant Date Fair Value | $       $ 39,000    
Shares Reserved (in shares) | shares       2,455,000    
Shares Available to Issue (in shares) | shares       1,642,000    
Options Outstanding (in shares) | shares       1,146,000    
Performance Awards Outstanding (in shares) | shares       497,000    
Weighted aerage grant date fair value (in usd per share) | $ / shares       $ 19.25    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross | shares       2,012    
Number Of Directors | director       2    
Directors compensation expense | $       $ 114,000 $ 84,000  
Dividends declared per common share (in dollars per Share) | $ / shares   $ 0.075 $ 0.075 $ 0.075 $ 0.075  
Dividends | $   $ 1,400,000 $ 1,200,000      
Risk-free interest rate       2.42%    
Share-Based Compensation Arrangement By Share-Based Payment Award, Non-Option Equity Instruments, Reserved Percentage       200.00%    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized | $       $ 2,000,000    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition       2 years 2 months 18 days    
Stock Repurchase Program, Remaining Authorized Repurchase Amount | $       $ 8,300,000    
ESPP            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Shares purchased through Employee Stock Purchase Plan (in Shares) | shares       20,796    
Weighted average purchase price of ESPP shares purchased during the period (in Dollars per share) | $ / shares       $ 13.18    
Share-based compensation expense | $       $ 105,000 $ 97,000  
Expected volatility       36.13%    
Expected holding period (years)       3 months    
Restricted Stock            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Share-based compensation expense | $       $ 217,000 245,000  
Stock Granted, Value, Share-based Compensation, Net of Forfeitures | $       $ 500,000    
Weighted aerage grant date fair value (in usd per share) | $ / shares       $ 19.94    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period | shares       25,550    
Restricted Stock | Maximum [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period       3 years    
Stock Options            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage       20.00%    
Share-based compensation expense | $       $ 204,000 480,000  
Performance Shares [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period | shares       248,500    
Expected volatility 25.70%          
Risk-free interest rate 2.47%          
Expected holding period (years) 4 years 10 months 10 days          
Officers And Key Employees [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Directors compensation expense | $       $ 19,000 276,000  
Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Granted In Period, Fair Value | $       1,100,000    
Board of Directors [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Quarterly Installment Of Annual Cash Retainer | $           $ 18,750
Annual Cash Retainer | $           75,000
Director [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Quarterly Installment Of Annual Cash Retainer | $           2,500
Annual Cash Retainer | $           10,000
Corporate Governance Committee Chairman [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Quarterly Installment Of Annual Cash Retainer | $           1,250
Annual Cash Retainer | $           $ 5,000
Good to Great Incentive Program [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock Granted, Value, Share-based Compensation, Net of Forfeitures | $       $ 294,000 $ 145,000  
Weighted aerage grant date fair value (in usd per share) | $ / shares       $ 19.92 $ 25.43  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period | shares       14,844 5,712  
Amended And Restated 2006 Plan [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Shares Reserved (in shares) | shares       0    
Shares Available to Issue (in shares) | shares       0    
Options Outstanding (in shares) | shares       964,000    
Performance Awards Outstanding (in shares) | shares       0    
Cancelled shares (in shares) | shares       900,000    
2017 Plan [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Shares Reserved (in shares) | shares       2,455,000    
Shares Available to Issue (in shares) | shares       1,642,000    
Options Outstanding (in shares) | shares       182,000    
Performance Awards Outstanding (in shares) | shares       497,000