Note 4 - Stock Benefit Plans (Detail) - Weighted-Average Assumptions For Determining Estimated Fair Value For Stock-Based Awards: (USD $)	9 Months Ended	12 Months Ended
Dec. 31, 2010	Dec. 31, 2012	Dec. 31, 2011
Expected life (in years)	5 years 6 months	1 year 36 days	4 years 109 days
Risk-free interest rate	1.70%	0.20%	1.50%
Expected volatility	44.00%	58.00%	44.00%
Forfeiture rate	40.00%	40.00%	40.00%
Weighted average fair value
Stock options (in Dollars per share)	$ 12.30	$ 13.32
Restricted stock (in Dollars per share)	$ 28.30	$ 27.34	$ 28.40

The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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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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