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Note 4 - Stock-based Compensation (Details) - Summary of the Balance and Activity for the Plans Related to Stock Options
6 Months Ended
Jun. 28, 2014
Restricted Stock [Member]
 
Note 4 - Stock-based Compensation (Details) - Summary of the Balance and Activity for the Plans Related to Stock Options [Line Items]  
Outstanding, December 28, 2013 720,198
Granted 189,970
Vested 337,051
Forfeited 82,291
Outstanding, June 28, 2014 490,826
Employee Stock Option [Member]
 
Note 4 - Stock-based Compensation (Details) - Summary of the Balance and Activity for the Plans Related to Stock Options [Line Items]  
Outstanding, December 28, 2013 1,065,012
Granted 96,222
Exercised 307,749
Forfeited 20,050
Canceled or expired 49,296
Outstanding, June 28, 2014 784,139