Note 9 - Employee Benefits (Detail) - Weighted average assumptions used to estimate fair value of service-based option awards granted as of the date of grant: (USD $)	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Expected option life in years(1)	6 years 36 days	[1]	6 years 109 days	[1]	6 years 36 days	[1]
Expected stock price volatility percentage(2)	37.00%	[2]	39.00%	[2]	39.00%	[2]
Risk-free interest rate percentage(3)	1.10%	[3]	2.40%	[3]	2.70%	[3]
Expected dividend yield(4)	0.49%	[4]	0.38%	[4]	0.05%	[4]
Fair value as of the date of grant (in Dollars per share)	$ 7.22		$ 8.54		$ 9.31

[1] Expected option life - We use historical employee exercise and option expiration data to estimate the expected life assumption for the Black-Scholes grant-date valuation. We believe that this historical data is currently the best estimate of the expected term of a new option. We use a weighted-average expected life for all awards.

[2] Expected stock price volatility - We use our stock's historical volatility for the same period of time as the expected life. We have no reason to believe that its future volatility will differ from the past.

[3] Risk-free interest rate - The rate is based on the U.S. Treasury yield curve in effect at the time of the grant for the same period of time as the expected life.

[4] Expected dividend yield - The calculation is based on the total expected annual dividend payout divided by the average stock price.