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Defined Contribution Plans (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 25, 2016
Dec. 27, 2015
Dec. 28, 2014
Note 14 - Defined Contribution Plans (Details) [Line Items]      
Employer discretionary contribution amount (in dollars) $ 3,190 $ 2,823 $ 2,907
Employer contribution (in dollars) $ 583 $ 669 $ 610
Minimum      
Note 14 - Defined Contribution Plans (Details) [Line Items]      
Maximum annual contributions per employee, percent 5.00%    
Maximum      
Note 14 - Defined Contribution Plans (Details) [Line Items]      
Maximum annual contributions per employee, percent 12.50%    
First 3%      
Note 14 - Defined Contribution Plans (Details) [Line Items]      
Employer matching contribution, percent of match 100.00%    
Employer matching contribution, percent of employees' gross contributions 3.00%    
Second 2%      
Note 14 - Defined Contribution Plans (Details) [Line Items]      
Employer matching contribution, percent of employees' gross contributions 2.00%    
Maximum annual contributions per employee, percent 50.00%