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Note 2 - Investment Securities (Details)
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2015
USD ($)
Sep. 30, 2014
USD ($)
Sep. 30, 2015
USD ($)
Sep. 30, 2014
USD ($)
Dec. 31, 2014
USD ($)
Note 2 - Investment Securities (Details) [Line Items]          
Number of Securities 483   483    
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 128   128    
Aggregate Depreciation from Amortized Cost Basis, Percent     1.00%    
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year 48   48    
Equity Securities [Member]          
Note 2 - Investment Securities (Details) [Line Items]          
Percentage of Investment Portfolio 1.00%   1.00%   1.00%
Other than Temporary Impairment Losses, Investments (in Dollars) $ 0 $ 0 $ 0 $ 0  
Debt Securities [Member]          
Note 2 - Investment Securities (Details) [Line Items]          
Other than Temporary Impairment Losses, Investments (in Dollars) $ 0 $ 0 $ 0 $ 0  
Revenue Bonds [Member] | Municipal Bonds [Member]          
Note 2 - Investment Securities (Details) [Line Items]          
Number of Issuers 81   81   64
Other Investments (in Dollars) $ 201,400,000   $ 201,400,000   $ 161,700,000
Number of States Investments Held In 8   8   8
Revenue Bonds [Member] | Municipal Bonds [Member] | Aggregate Fair Value Exceeding $5 Million [Member]          
Note 2 - Investment Securities (Details) [Line Items]          
Number of States Investments Held In 4   4   4
Revenue Bonds [Member] | Stockholders' Equity, Total [Member] | Credit Concentration Risk [Member]          
Note 2 - Investment Securities (Details) [Line Items]          
Concentration Risk, Percentage     0.00%   0.00%
General Obligation Bonds [Member] | Municipal Bonds [Member]          
Note 2 - Investment Securities (Details) [Line Items]          
Number of Issuers 64,700,000   64,700,000   77
Other Investments (in Dollars) $ 87,000,000   $ 87,000,000   $ 68,800,000
Number of States Investments Held In 19   19   19
General Obligation Bonds [Member] | Municipal Bonds [Member] | Aggregate Fair Value Exceeding $5 Million [Member]          
Note 2 - Investment Securities (Details) [Line Items]          
Number of States Investments Held In 4   4   3
General Obligation Bonds [Member] | Stockholders' Equity, Total [Member] | Credit Concentration Risk [Member]          
Note 2 - Investment Securities (Details) [Line Items]          
Concentration Risk, Percentage     0.00%   0.00%
Minimum [Member] | Revenue Bonds [Member] | Municipal Bonds [Member]          
Note 2 - Investment Securities (Details) [Line Items]          
Other Investments (in Dollars) $ 5,000,000   $ 5,000,000    
Number of States Investments Held In         5,000,000
Minimum [Member] | General Obligation Bonds [Member] | Municipal Bonds [Member]          
Note 2 - Investment Securities (Details) [Line Items]          
Other Investments (in Dollars) $ 5,000,000   $ 5,000,000   $ 5,000,000