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Note 11 - The Assumptions Used in the Option Pricing Model (Details) - Employee Stock Option [Member]
12 Months Ended
Jan. 02, 2016
Jan. 03, 2015
Dec. 28, 2013
Minimum [Member]      
Historical volatility 51.00%    
Risk-free rate 1.50% 1.70%  
Expected life (years)   6 years  
Maximum [Member]      
Historical volatility 58.00%    
Risk-free rate 1.80% 2.10%  
Expected life (years)   6 years 91 days  
Dividend yield 0.00% 0.00% 0.00%
Historical volatility   65.00% 65.00%
Risk-free rate     1.30%
Expected life (years) 6 years   6 years 91 days