Note 3 - Business Combinations (Detail) (USD $)			5 Months Ended	10 Months Ended
	Mar. 31, 2013	Dec. 31, 2012	Oct. 02, 2012 Citizens South Banking Corporation [Member]	Oct. 31, 2011 Citizens South Banking Corporation [Member]	Sep. 28, 2012 Citizens South Banking Corporation [Member]
Business Acquisition Price Per Share Paid (in Dollars per share)			$ 7.00
Business Acquisition Stock Issued Per Share of Stock Held (in Dollars per share)			$ 1.4799
Maximum Percent of Merger Allowable in Cash			30.00%
Maximum Amount of Merger Paid in Common Stock			70.00%
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares (in Shares)			11,857,226
Business Acquisition, Cost of Acquired Entity, Cash Paid			$ 24,300,000
Closing Share Price (in Dollars per share)					$ 4.94
Business Acquisition, Cost of Acquired Entity, Purchase Price					82,900,000
Preferred Stock, Shares Issued (in Shares)	20,500	20,500	20,500
Business Acquisition, Purchase Price Allocation, Goodwill Amount				22,500,000
Business Acquisition Cash Paid for Fractional Shares				$ 1,600,000