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Note 5 - Investment Securities (Details)
3 Months Ended 6 Months Ended
Jun. 30, 2015
USD ($)
Jun. 30, 2014
USD ($)
Jun. 30, 2015
USD ($)
Jun. 30, 2014
USD ($)
Dec. 31, 2014
USD ($)
Jul. 31, 2014
USD ($)
Note 5 - Investment Securities (Details) [Line Items]            
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Additions, Additional Credit Losses $ 0 $ 7,000 $ 3,000 $ 7,000    
Securities, Continuous Loss Position, Accumulated Loss 3,700,000   3,700,000   $ 2,400,000  
Securities, Continuous Unrealized Loss Position, Fair Value 104,000,000   104,000,000   $ 62,200,000  
Gain on Sale of Investments 155,000 458,000 155,000 458,000    
Loss on Sale of Investments 146,000   146,000      
Proceeds from Sale and Maturity of Marketable Securities $ 4,100,000 $ 5,700,000 4,100,000 5,700,000    
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax     $ 3,000 $ 165,000    
Mortgage-backed Securities, Issued by Private Enterprises [Member]            
Note 5 - Investment Securities (Details) [Line Items]            
Number of Securities in Investment Portfolio 0   0   0  
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 5   5      
Mortgage-backed Securities, Issued by Private Enterprises [Member] | Alt-A [Member]            
Note 5 - Investment Securities (Details) [Line Items]            
Number of Securities in Investment Portfolio 0   0   0  
Mortgage-backed Securities, Issued by Private Enterprises [Member] | Subprime [Member]            
Note 5 - Investment Securities (Details) [Line Items]            
Number of Securities in Investment Portfolio 0   0   0  
Collateralized Mortgage Obligations [Member]            
Note 5 - Investment Securities (Details) [Line Items]            
Number of Securities in Investment Portfolio 0   0   0  
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 15   15      
Held-to-maturity Securities Transferred from Available-for-sale           $ 70,100,000
Securities Transferred to Held-to-maturity Unrealized Gain (Loss) $ (1,000,000)   $ (1,000,000)     $ (1,200,000)
Collateralized Mortgage Obligations [Member] | Alt-A [Member]            
Note 5 - Investment Securities (Details) [Line Items]            
Number of Securities in Investment Portfolio 0   0   0  
Collateralized Mortgage Obligations [Member] | Subprime [Member]            
Note 5 - Investment Securities (Details) [Line Items]            
Number of Securities in Investment Portfolio 0   0   0  
US States and Political Subdivisions Debt Securities [Member]            
Note 5 - Investment Securities (Details) [Line Items]            
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 14   14