Note 1 - Capital Purchase Program (Detail) (USD $)	1 Months Ended	12 Months Ended	72 Months Ended
	Jan. 23, 2009	Dec. 31, 2015	Dec. 31, 2014	Jun. 30, 2012	Dec. 31, 2011	Jun. 30, 2012 Preferred Dividends in Arrears [Member]	Jun. 30, 2011 Preferred Dividends in Arrears [Member]
Proceeds from Issuance of Common Stock (in Dollars)	$ 25,083,000
Preferred Stock, Shares Issued (in Shares)	25,083			25,083	25,083
Preferred Stock, Dividend Rate, Percentage	5.00%	9.00%	5.00%
Preferred Stock, Par or Stated Value Per Share (in Dollars per share)	$ 0.01			$ 0	$ 0
Preferred Stock, Liquidation Preference Per Share (in Dollars per share)	$ 1,000
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in Shares)	155,025
Common Stock, Par or Stated Value Per Share (in Dollars per share)	$ 5.00			$ 5	$ 5
Class of Warrant or Right, Exercise Price of Warrants or Rights (in Dollars per Item)	24.27
Dividends Payable (in Dollars)						$ (1,881,000)	$ (627,000)