Note 11 - Preferred Stock (Detail) (USD $)			1 Months Ended				6 Months Ended	1 Months Ended	0 Months Ended	6 Months Ended
	Jun. 30, 2012	Dec. 31, 2011	Sep. 22, 2011 Senior Non-Cumulative Perpetual Preferred Stock, Series C [Member] Minimum [Member] Second Through Tenth Dividend Period [Member]	Sep. 22, 2011 Senior Non-Cumulative Perpetual Preferred Stock, Series C [Member] Minimum [Member] Eleventh Through First Half of Nineteenth Dividend Period [Member]	Sep. 22, 2011 Senior Non-Cumulative Perpetual Preferred Stock, Series C [Member] Maximum [Member] Second Through Tenth Dividend Period [Member]	Sep. 22, 2011 Senior Non-Cumulative Perpetual Preferred Stock, Series C [Member] Maximum [Member] Eleventh Through First Half of Nineteenth Dividend Period [Member]	Jun. 30, 2012 Senior Non-Cumulative Perpetual Preferred Stock, Series C [Member] Stock Outstanding After Four and a Half Years [Member]	Sep. 22, 2011 Senior Non-Cumulative Perpetual Preferred Stock, Series C [Member]	Dec. 12, 2008 Senior Non-Cumulative Perpetual Preferred Stock, Series C [Member]	Jun. 30, 2012 Senior Non-Cumulative Perpetual Preferred Stock, Series C [Member]
Preferred Stock, Shares Issued (in Shares)	20,500	20,500						20,500
Preferred Stock, Liquidation Preference Per Share (in Dollars per share)								$ 1,000
Proceeds from Issuance of Preferred Stock and Preference Stock (in Dollars)								$ 20,500,000
Preferred Stock, Dividend Rate, Percentage			1.00%	1.00%	5.00%	7.00%	9.00%	4.84%		1.30%
Stock Redeemed or Called During Period, Shares (in Shares)									20,500
Payments for Repurchase of Preferred Stock and Preference Stock (in Dollars)									20,600,000
Preferred Stock, Redemption Amount (in Dollars)									$ 20,500,000