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Note 10 - Federal Funds Purchased and Lines of Credit (Details)
Mar. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Note 10 - Federal Funds Purchased and Lines of Credit (Details) [Line Items]    
Federal Funds Purchased $ 0 $ 0
Line of Credit Facility, Number of Lenders 3  
Collateralized Agreements $ 40,000,000  
Federal Home Loan Bank (FHLB) [Member]    
Note 10 - Federal Funds Purchased and Lines of Credit (Details) [Line Items]    
Long-term Line of Credit 0 75,000,000
Line of Credit Facility, Maximum Borrowing Capacity   $ 297,700,000
Federal Reserve [Member]    
Note 10 - Federal Funds Purchased and Lines of Credit (Details) [Line Items]    
Line of Credit Facility, Maximum Borrowing Capacity $ 17,500,000  
Minimum [Member]    
Note 10 - Federal Funds Purchased and Lines of Credit (Details) [Line Items]    
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Interest Rate 0.53%  
Maximum [Member]    
Note 10 - Federal Funds Purchased and Lines of Credit (Details) [Line Items]    
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Interest Rate 1.38%