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Note 7 - Shareholders' Equity (Detail) - Weighted average assumptions used to value stock options granted (Non-Market Performance Stock-Based Awards [Member])
3 Months Ended
Mar. 31, 2013
Apr. 01, 2012
Non-Market Performance Stock-Based Awards [Member]
   
Risk-free interest rate 0.65% 0.66%
Volatility factor 63.17% 62.93%
Dividends 0.00% 0.00%
Weighted average expected life (years) 4 years 10 days 3 years 332 days