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Note 3 - Investment Securities (Details)
12 Months Ended
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Note 3 - Investment Securities (Details) [Line Items]      
Number of Securities 470    
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 136    
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 49    
Other than Temporary Impairment Losses, Investments (in Dollars)   $ 0 $ 0
Security Owned and Pledged as Collateral, Fair Value (in Dollars) $ 248,277,471 $ 402,507,865  
Equity Securities [Member]      
Note 3 - Investment Securities (Details) [Line Items]      
Percentage of Investment Portfolio 1.00% 1.00%  
Debt Securities [Member]      
Note 3 - Investment Securities (Details) [Line Items]      
Other than Temporary Impairment Losses, Investments (in Dollars) $ 0    
Revenue Bonds [Member] | Municipal Bonds [Member]      
Note 3 - Investment Securities (Details) [Line Items]      
Number of Issuers 82 64  
Other Investments (in Dollars) $ 214,400,000 $ 161,700,000  
Number of States Investments Held In 9 8  
Revenue Bonds [Member] | Municipal Bonds [Member] | Aggregate Fair Value Exceeding $5 Million [Member]      
Note 3 - Investment Securities (Details) [Line Items]      
Number of States Investments Held In 4 4  
General Obligation Bonds [Member] | Municipal Bonds [Member]      
Note 3 - Investment Securities (Details) [Line Items]      
Number of Issuers 92,000,000 77  
Other Investments (in Dollars) $ 67,800,000 $ 68,800,000  
Number of States Investments Held In 19 19  
General Obligation Bonds [Member] | Municipal Bonds [Member] | Aggregate Fair Value Exceeding $5 Million [Member]      
Note 3 - Investment Securities (Details) [Line Items]      
Number of States Investments Held In 4 3  
General Obligation Bonds [Member] | Stockholders' Equity, Total [Member] | Credit Concentration Risk [Member]      
Note 3 - Investment Securities (Details) [Line Items]      
Concentration Risk, Percentage 0.00% 0.00%  
Minimum [Member] | Revenue Bonds [Member] | Municipal Bonds [Member]      
Note 3 - Investment Securities (Details) [Line Items]      
Other Investments (in Dollars) $ 5,000,000 $ 5,000,000  
Minimum [Member] | General Obligation Bonds [Member] | Municipal Bonds [Member]      
Note 3 - Investment Securities (Details) [Line Items]      
Other Investments (in Dollars) $ 5,000,000 $ 5,000,000