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Note 2 - Investment Securities (Details)
3 Months Ended
Mar. 31, 2016
USD ($)
Mar. 31, 2015
USD ($)
Dec. 31, 2015
Note 2 - Investment Securities (Details) [Line Items]      
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 36   0
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities $ 16,500,000    
Available-for-sale Securities, Gross Realized Gains 5,000 $ 55,000  
Available-for-sale Securities, Gross Realized Losses $ 0 $ 15,000  
US Government Agencies Debt Securities [Member]      
Note 2 - Investment Securities (Details) [Line Items]      
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 17    
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]      
Note 2 - Investment Securities (Details) [Line Items]      
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 11    
US States and Political Subdivisions Debt Securities [Member]      
Note 2 - Investment Securities (Details) [Line Items]      
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 8