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Note 8 - Subsequent Event (Detail) (Subsequent Event [Member], USD $) In Millions, except Share data, unless otherwise specified	0 Months Ended
	Apr. 26, 2013	Apr. 23, 2013
Subsequent Event [Member]
Stock Issued During Period, Shares, New Issues		1,374,250
Equity Issuance, Per Share Amount (in Dollars per share)		$ 32.00
Proceeds from Issuance or Sale of Equity (in Dollars)		$ 41.2
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized	800,000

The cash inflow from the issuance of common stock, preferred stock, treasury stock, stock options, and other types of equity.

Number of new stock issued during the period.