Note 2 - Correction of Immaterial Errors (Tables)
 9 Months Ended
Oct. 01, 2016
Adjustments to Statement of Shareholders' Equity Elements [Member]  
Notes Tables  
Schedule of Error Corrections and Prior Period Adjustments [Table Text Block]
 
 
Year Ended January 2, 2016
 
 
Year Ended December 27, 2014
 
 
 
Previously
Reported
 
 
Adjustment
 
 
As Revised
 
 
Previously
Reported
 
 
Adjustment
 
 
As Revised
 
Net income
   $ 82,466     $ (1,600
)
   $ 80,866     $ 99,418     $ (1,318
)
   $ 98,100  
Comprehensive income
     57,921       (1,600
)
     56,321       57,875       (1,318
)
     56,557  
Retained earnings
     562,717       (4,946
)
     557,771       523,302       (3,346
)
     519,956  
Total shareholders’ equity
     744,198       (4,946
)
     739,252       727,665       (3,346
)
     724,319  
 
 
December 28, 2013
 
 
 
Previously
Reported
 
 
Adjustment
 
 
As Revised
 
Retained earnings
   $ 445,059     $ (2,028
)
   $ 443,031  
Total shareholders’ equity
     686,916       (2,028
)
     684,888  
Adjustments to Statement of Cash Flow Elements [Member]  
Notes Tables  
Schedule of Error Corrections and Prior Period Adjustments [Table Text Block]
 
 
Year Ended January 2, 2016
 
 
Year Ended December 27, 2014
 
 
 
Previously
Reported
 
 
Adjustment
 
 
As Revised
 
 
Previously
Reported
 
 
Adjustment
 
 
As Revised
 
Net income
   $ 82,466     $ (1,600
)
   $ 80,866     $ 99,418     $ (1,318
)
   $ 98,100  
Accrued taxes
     (1,043
)
     1,600       557       (549
)
     1,318       769  
Net cash provided by operating activities
     165,826       —       165,826       153,141       —       153,141  
Adjustments to Statement of Income Elements [Member]  
Notes Tables  
Schedule of Error Corrections and Prior Period Adjustments [Table Text Block]
 
 
Year Ended January 2, 2016
 
 
Year Ended December 27, 2014
 
 
 
Previously
Reported
 
 
Adjustment
 
 
As Revised
 
 
Previously
Reported
 
 
Adjustment
 
 
As Revised
 
Income taxes
   $ 24,482     $ 1,600     $ 26,082     $ 32,228     $ 1,318     $ 33,546  
Net income
     82,466       (1,600
)
     80,866       99,418       (1,318
)
     98,100  
Net income per share - Basic
   $ 3.65     $ (0.07
)
   $ 3.58     $ 4.41     $ (0.06
)
   $ 4.35  
Net income per share - Diluted
   $ 3.63     $ (0.07
)
   $ 3.56     $ 4.37     $ (0.05
)
   $ 4.32  
Adjustments to Balance Sheet Elements [Member]  
Notes Tables  
Schedule of Error Corrections and Prior Period Adjustments [Table Text Block]
 
 
January 2, 2016
 
 
 
Previously
Reported
 
 
Adjustment
 
 
As Revised
 
Other long-term liabilities
   $ 12,809     $ 4,946     $ 17,755  
Total equity
     744,198       (4,946
)
     739,252