Note 1 - Accounting Policy (Detail) - Estimated Fair Market Value Assumptions - ESPP (USD $)	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Expected volatility	53.50%	65.20%	66.00%
Risk-free interest rate	0.07%	0.06%	0.15%
Expected life (in years)	3 months	3 months	3 months
Fair value (in Dollars per share)	$ 1.54	$ 1.19	$ 1.45

The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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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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