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Note 9 - Common Stock (Detail) - Fair Value Assumptions of Each Grant (USD $)	12 Months Ended
	Dec. 21, 2012	Dec. 21, 2011	Dec. 21, 2010
Weighted average risk free interest rates	1.83%	3.01%	2.84%
Weighted average life (in years)	10 years	10 years	10 years
Volatility	66.10%	64.81%	63.37%
Expected dividend yield	0.00%	0.00%	0.00%
Weighted average grant-date fair value per share of options granted (in Dollars per share)	$ 2.87	$ 2.20	$ 1.24

The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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