Income Taxes (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 27, 2014
Dec. 28, 2013
Dec. 29, 2012
Current:      
Federal $ 3,217 $ 2,471 $ 3,728
State 408 262 380
Total current provision for income taxes 3,625 2,733 4,108
Deferred:      
Federal 2,124 547 108
State 19 80 16
Total deferred provision for income taxes 2,143 627 124
Income tax expense 5,768 3,360 4,232
Deferred Tax Asset      
Accounts receivable 40 81  
Inventories 23 82  
Accrued liabilities 465 341  
State credit carryover 101    
Stock-based compensation 598 252  
Deferred rent 96 126  
Interest rate swap 130 193  
Net deferred tax asset 1,453 1,075  
Deferred Tax Liability      
Contingent consideration (1,126)    
Depreciation and amortization (5,968) (4,508)  
Gross deferred tax liability 7,094 4,508  
Net deferred tax liability (5,641) (3,433)  
Net deferred tax liability      
Net deferred tax asset - current 1,228 755  
Net deferred tax liability - noncurrent (6,869) (4,188)  
Net deferred tax liability $ (5,641) $ (3,433)