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Note 2 - Investment Securities (Details)
3 Months Ended 12 Months Ended
Mar. 31, 2016
USD ($)
Mar. 31, 2015
USD ($)
Dec. 31, 2015
USD ($)
Note 2 - Investment Securities (Details) [Line Items]      
Number of Securities 465    
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 58    
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 21    
Other than Temporary Impairment Losses, Investments (in Dollars)   $ 0  
Equity Securities [Member]      
Note 2 - Investment Securities (Details) [Line Items]      
Percentage of Investment Portfolio 1.00%   1.00%
Other than Temporary Impairment Losses, Investments (in Dollars) $ 0 $ 0  
Debt Securities [Member]      
Note 2 - Investment Securities (Details) [Line Items]      
Other than Temporary Impairment Losses, Investments (in Dollars) $ 0    
Revenue Bonds [Member] | Municipal Bonds [Member]      
Note 2 - Investment Securities (Details) [Line Items]      
Number of Issuers 82   92
Other Investments (in Dollars) $ 215,600,000   $ 214,400,000
Number of States Investments Held In 9   9
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
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%
Revenue Bonds [Member] | Minimum [Member] | Municipal Bonds [Member]      
Note 2 - Investment Securities (Details) [Line Items]      
Other Investments (in Dollars) $ 5,000,000   $ 5,000,000
General Obligation Bonds [Member] | Municipal Bonds [Member]      
Note 2 - Investment Securities (Details) [Line Items]      
Number of Issuers 95   82
Other Investments (in Dollars) $ 72,700,000   $ 67,800,000
Number of States Investments Held In 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
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%
General Obligation Bonds [Member] | Minimum [Member] | Municipal Bonds [Member]      
Note 2 - Investment Securities (Details) [Line Items]      
Other Investments (in Dollars) $ 5,000,000   $ 5,000,000