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Note 7 - Shareholders' Equity (Detail) - Weighted average assumptions used to value stock options granted
6 Months Ended
Jul. 01, 2012
Jul. 03, 2011
Non-Market Performance Stock-Based Awards [Member]
   
Risk-free interest rate 0.59% 1.22%
Volatility factor 62.88% 60.63%
Dividends 0.00% 0.00%
Weighted average expected life (years) 3 years 332 days 3 years 299 days
Market Performance Stock-Based Awards [Member]
   
Risk-free interest rate   2.74%
Volatility factor   63.79%
Dividends   0.00%
Weighted average expected life (years)   5 years 186 days