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Note 7 - 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 7 - Investment Securities (Details) [Line Items]          
Trading Gain (Loss) $ 36,000 $ 40,000 $ 17,000 $ 155,000  
Trading Securities, Change in Unrealized Holding Gain (Loss)     29,000   $ 24,000
Available-for-sale Securities, Gross Realized Gains (Losses), Sale Proceeds 685,000 534,000 27,480,000 19,504,000  
Available-for-sale Securities Pledged as Collateral 238,281,000   238,281,000   206,774,000
Income Tax Expense (Benefit) Related to Net Realized Gains (Losses) On Sales of Securities     273,000 370,000  
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Additions, Additional Credit Losses     0 0  
Proceeds from Sale of Held-to-maturity Securities 0 0 0 0  
Available-for-sale Securities, Amortized Cost Basis 360,660,000   360,660,000   373,844,000
Available-for-sale Securities $ 362,568,000   $ 362,568,000   375,219,000
Fair Value Inputs, Prepayment Rate     1.00%    
Threshold for Identifying Banks with Trust Preferred Securities     $ 15,000,000,000    
Minimum Cost Saving for Refinance 2.00%   2.00%    
Fair Value Inputs, Loss Severity     95.00%    
Collateralized Debt Obligations [Member]          
Note 7 - Investment Securities (Details) [Line Items]          
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Additions, Additional Credit Losses $ 0 $ 0 $ 0 $ 0  
Number of Trust Preferred Securities 6   6    
Available-for-sale Securities, Amortized Cost Basis $ 3,409,000   $ 3,409,000   3,519,000
Available-for-sale Securities $ 2,600,000   $ 2,600,000   $ 2,439,000
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year 5   5    
Minimum [Member] | Collateralized Debt Obligations [Member]          
Note 7 - Investment Securities (Details) [Line Items]          
Fair Value Inputs, Loss Severity     0.00%    
Maximum [Member] | Collateralized Debt Obligations [Member]          
Note 7 - Investment Securities (Details) [Line Items]          
Fair Value Inputs, Loss Severity     100.00%