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Note 5 - Loans (Details)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2015
USD ($)
Jun. 30, 2014
Jun. 30, 2015
USD ($)
Jun. 30, 2014
Dec. 31, 2014
USD ($)
Note 5 - Loans (Details) [Line Items]          
Fair Value of Collateral Dependent Loans, As a Percentage of Appraised Or Estimated Value of Collateral     85.00%    
Collateral Dependent Impaired Loans, Measured By Third Party Appraisals (in Dollars)     $ 26.0    
Collateral Dependent Impaired Loans, Measured By Third Party Appraisals, Percentage     65.90%    
Collateral Dependent Impaired Loans, Measured Internally (in Dollars)     $ 13.5    
Collateral Dependent Impaired Loans, Measured Internally, Percentage     34.10%    
Financing Receivable, Modifications, Number of Contracts 0 0 1 0  
Financing Receivable, Modifications During Period, Recorded Investment (in Dollars)     $ 0.4    
Commitments and Contingencies (in Dollars)          
Extension of Credit [Member]          
Note 5 - Loans (Details) [Line Items]          
Commitments and Contingencies (in Dollars) $ 131.4   $ 131.4    
Extension of Lines of Credit [Member]          
Note 5 - Loans (Details) [Line Items]          
Commitments and Contingencies (in Dollars) $ 202.4   $ 202.4