Quarterly report pursuant to Section 13 or 15(d)

Long-Term Debt (Details Textual)

v3.5.0.2
Long-Term Debt (Details Textual)
9 Months Ended
Oct. 01, 2016
USD ($)
CreditFacility
Jul. 29, 2016
USD ($)
Aug. 01, 2011
USD ($)
CreditFacility
Oct. 01, 2016
USD ($)
Sep. 26, 2015
USD ($)
Debt Instrument [Line Items]          
Credit facilities, maximum capacity     $ 50,000,000    
Line of Credit Amortization       $ 0 $ 0
Effective date     Aug. 01, 2011    
Number Of Credit Facilities | CreditFacility 0   3    
Revolving Credit Facility [Member]          
Debt Instrument [Line Items]          
Credit facilities, maximum capacity $ 35,000,000     35,000,000  
Unsecured Revolving Line of Credit [Member]          
Debt Instrument [Line Items]          
Credit facilities, maximum capacity 15,000,000     15,000,000  
Secured Revolving Line of Credit [Member]          
Debt Instrument [Line Items]          
Credit facilities, maximum capacity 15,000,000     $ 15,000,000  
Line of Credit [Member]          
Debt Instrument [Line Items]          
Line of Credit Amortization $ 0        
Line of Credit [Member] | Revolving Credit Facility [Member]          
Debt Instrument [Line Items]          
Credit facilities, maximum capacity   $ 100,000,000      
Accordion feature to increase maximum capacity   $ 75,000,000      
Interest coverage ratio (percent)   3.00%      
Leverage ratio (percent)   3.5      
Line of Credit [Member] | Swing Loans [Member]          
Debt Instrument [Line Items]          
Credit facilities, maximum capacity   $ 15,000,000      
Line of Credit [Member] | Letter of Credit [Member]          
Debt Instrument [Line Items]          
Credit facilities, maximum capacity   $ 5,000,000      
Line of Credit [Member] | Minimum [Member] | Euro Rate [Member] | Revolving Credit Facility [Member]          
Debt Instrument [Line Items]          
Variable interest rate (percent)   1.25%      
Line of Credit [Member] | Minimum [Member] | Base Rate [Member] | Revolving Credit Facility [Member]          
Debt Instrument [Line Items]          
Variable interest rate (percent)   0.25%      
Line of Credit [Member] | Maximum [Member] | Euro Rate [Member] | Revolving Credit Facility [Member]          
Debt Instrument [Line Items]          
Variable interest rate (percent)   2.00%      
Line of Credit [Member] | Maximum [Member] | Base Rate [Member] | Revolving Credit Facility [Member]          
Debt Instrument [Line Items]          
Variable interest rate (percent)   1.00%