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Note 10 - Preferred Stock (Detail) (USD $)	3 Months Ended		3 Months Ended			3 Months Ended			12 Months Ended
Note 10 - Preferred Stock (Detail) (USD $)	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2013 Minimum [Member] Second Through Tenth Dividend Periods [Member]	Mar. 31, 2013 Minimum [Member] Eleventh Through First Half of the Nineteenth Dividend Periods [Member]	Mar. 31, 2013 Minimum [Member]	Mar. 31, 2013 Maximum [Member] Second Through Tenth Dividend Periods [Member]	Mar. 31, 2013 Maximum [Member] Eleventh Through First Half of the Nineteenth Dividend Periods [Member]	Mar. 31, 2013 Citizens South Banking Corporation [Member]	Dec. 31, 2012 After Four and a Half Years [Member]
Preferred Stock, Shares Issued (in Shares)	20,500	20,500
Preferred Stock, Liquidation Preference Per Share (in Dollars per share)	$ 1,000
Preferred Stock, Dividend Rate, Percentage	1.00%		1.00%	1.00%		5.00%	7.00%	4.84%	9.00%
Percentage of Signing Date Tier 1 Capital					90.00%
Reduction of Tier 1 Capital Requirements Per Year	10.00%

The per share liquidation preference (or restrictions) of nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) that has a preference in involuntary liquidation considerably in excess of the par or stated value of the shares. The liquidation preference is the difference between the preference in liquidation and the par or stated values of the share.

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