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Equity Plans (Details)
$ / shares in Units, $ in Thousands
3 Months Ended
Jan. 26, 2016
$ / shares
shares
Jan. 04, 2016
vesting_installment
$ / shares
shares
Mar. 31, 2016
USD ($)
shares
Mar. 31, 2015
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation costs charged to income:     $ 473 $ 399
Adjustment to Additional Paid in Capital, Income Tax Effect from Share-based Compensation, Net     108 526
Proceeds from ESPP and similar instruments:     $ 451 433
Incentive Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Remaining shares available for issuance under the Incentive Plan (shares) | shares     1,000,614  
Shares issuable upon exercise of Incentive Plan awards (shares) | shares     239,918  
Employee Stock Purchase Plan (ESPP)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation costs charged to income:     $ 79 76
Proceeds from ESPP and similar instruments:     451 433
Unrecognized compensation costs     $ 55  
Purchase price of common stock under ESPP (percent)     85.00%  
Maximum percentage of base compensation employees can designate for stock purchases under ESPP (percent)     10.00%  
Plan expense     $ 40 39
Restricted stock and deferred restricted stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation costs charged to income:     394 323
Adjustment to Additional Paid in Capital, Income Tax Effect from Share-based Compensation, Net     108 $ 526
Unrecognized compensation costs     $ 1,705  
Recognition period for unrecognized compensation cost     1 year 2 months 9 days  
Restricted Stock Units (RSUs)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of equity instruments granted (shares) | shares   17,835    
Number of equal successive installments for vesting of stock awards (vesting installments) | vesting_installment   3    
Grant date fair value of equity instruments granted (usd per share) | $ / shares   $ 27.02    
Common Stock | Employee Stock Purchase Plan (ESPP)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares authorized for issuance under the plan (shares) | shares     400,000  
Officer [Member] | Restricted Stock Units (RSUs)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of equity instruments granted (shares) | shares 12,473      
Grant date fair value of equity instruments granted (usd per share) | $ / shares $ 29.46      
Officer [Member] | Minimum | Performance Shares [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Target vesting percentage 0.00%      
Officer [Member] | Maximum | Performance Shares [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Target vesting percentage 150.00%