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Note 8 - Borrowings (Details) - USD ($)
1 Months Ended 12 Months Ended
Jun. 30, 2015
May. 31, 2013
Nov. 30, 2011
Dec. 31, 2015
Dec. 31, 2013
Dec. 31, 2014
Jan. 31, 2008
Note 8 - Borrowings (Details) [Line Items]              
Federal Home Loan Bank Percentage of Fair Value of Collateral       35.00%      
Securities Sold under Agreements to Repurchase           $ 10,000,000  
Proceeds from (Payments for) in Securities Sold under Agreements to Repurchase $ (10,000,000)     $ (10,000,000) $ (15,000,000)    
Repayments of Lines of Credit, Prepayment Penalty, Securities Sold Under Agreements to Repurchase $ 463,992            
Barclays Capital Inc [Member]              
Note 8 - Borrowings (Details) [Line Items]              
Securities Sold under Agreements to Repurchase             $ 30,000,000
Assets Sold under Agreements to Repurchase, Interest Rate             2.65%
Repayments of Lines of Credit   $ 15,000,000 $ 5,000,000        
Mortgage Loans Free of Other Pledges Liens and Encumbrances Member]              
Note 8 - Borrowings (Details) [Line Items]              
Federal Home Loan Bank Percentage of Fair Value of Collateral       80.00%      
Investment Securities Free of Other Pledges Liens and Encumbrances [Member]              
Note 8 - Borrowings (Details) [Line Items]              
Federal Home Loan Bank Percentage of Fair Value of Collateral       95.00%      
Federal Home Loan Bank [Member]              
Note 8 - Borrowings (Details) [Line Items]              
Line of Credit Facility, Remaining Borrowing Capacity       $ 116,000,000      
Federal Reserve Bank Borrowings [Member]              
Note 8 - Borrowings (Details) [Line Items]              
Line of Credit Facility, Remaining Borrowing Capacity       30,600,000      
Long-term Line of Credit       $ 0   $ 0