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Note 8 - Borrowings (Details Textual) - USD ($)
1 Months Ended 12 Months Ended
Jun. 30, 2015
May 31, 2013
Nov. 30, 2011
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Jan. 31, 2008
Federal Home Loan Bank Percentage of Fair Value of Collateral       35.00%      
Proceeds from (Payments for) in Securities Sold under Agreements to Repurchase $ (10,000,000)     $ (10,000,000)  
Repayments of Lines of Credit, Prepayment Penalty, Securities Sold Under Agreements to Repurchase $ 463,992            
Barclays Capital Inc [Member]              
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        
Federal Home Loan Bank [Member]              
Line of Credit Facility, Remaining Borrowing Capacity       59,800,000      
Federal Reserve Bank Borrowings [Member]              
Line of Credit Facility, Remaining Borrowing Capacity       25,200,000      
Long-term Line of Credit       $ 0 $ 0    
Mortgage Loans Freeof Other Pledges Liensand Encumbrances [Member]              
Federal Home Loan Bank Percentage of Fair Value of Collateral       80.00%      
Investment Securities Freeof Other Pledges Liensand Encumbrances [Member]              
Federal Home Loan Bank Percentage of Fair Value of Collateral       95.00%