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16. Shareholders' Equity (Details) (USD $)	12 Months Ended
16. Shareholders' Equity (Details) (USD $)	Dec. 31, 2012	Dec. 31, 2011
Stock Options
Estimated fair value of underlying common stock		$ 0.54
Remaining life	5 years	5 years
Risk-free interest rate		0.83%
Expected volatility		100.00%
Dividend yield
Minimum [Member]
Stock Options
Estimated fair value of underlying common stock	0.35
Risk-free interest rate	0.69%
Expected volatility	80.00%
Maximum [Member]
Stock Options
Estimated fair value of underlying common stock	0.38
Risk-free interest rate	0.80%
Expected volatility	89.00%

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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