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Note 6 - Stockholders' Equity: (Detail) - Stock Options - Valuation Assumptions	3 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Volatility	66.00%	84.00%
Dividend yield		0.00%
Risk-free interest rate	0.32%	1.37%
Expected term (years)	3 years 18 days	4 years 36 days
Minimum [Member]
Volatility	60.00%	61.00%
Dividend yield	0.00%	0.00%
Risk-free interest rate	0.31%	0.25%
Expected term (years)	2 years 240 days	2 years
Maximum [Member]
Volatility	68.00%	88.00%
Dividend yield	0.00%	0.00%
Risk-free interest rate	0.34%	2.02%
Expected term (years)	3 years 3 months	4 years 6 months

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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