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Note 8 - Borrowings (Detail) (USD $)
1 Months Ended
Nov. 30, 2011
Dec. 31, 2012
Dec. 31, 2011
Sep. 30, 2009
Jan. 31, 2008
Sep. 30, 2007
Percentage of Assets Federal Home Loan Bank Advances Limit   25.00%        
Securities Sold under Agreements to Repurchase   $ 25,000,000 $ 25,000,000   $ 30,000,000 $ 9,800,000
Assets Sold under Agreements to Repurchase, Interest Rate       3.56% 2.65%  
Increase (Decrease) in Payables under Repurchase Agreements 5,000,000          
Available-for-sale Securities Pledged as Collateral   29,900,000 32,200,000      
Mortgage Loans Free of Other Pledges, Liens, and Encumbrances [Member]
           
Federal Home Loan Bank Percentage of Fair Value of Collateral   80.00%        
Investment Securities Free of Other Pledges, Liens, and Encumbrances [Member]
           
Federal Home Loan Bank Percentage of Fair Value of Collateral   95.00%        
Federal Home Loan Bank [Member]
           
Line of Credit Facility, Remaining Borrowing Capacity   64,600,000        
Federal Reserve Bank Borrowings [Member]
           
Line of Credit Facility, Maximum Borrowing Capacity   $ 30,900,000