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Note 4 - Investment Securities (Details) - USD ($)
1 Months Ended 12 Months Ended
Jun. 30, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Note 4 - Investment Securities (Details) [Line Items]        
Available-for-sale Securities   $ 186,751,000 $ 100,226,000  
Available-for-sale, Securities in Unrealized Loss Positions, Depreciation from Amortized Cost, Percentage   0.60%    
Available-for-sale Securities, Gross Realized Gains (Losses), Sale Proceeds   $ 0    
Equity Method Investment Number Of Common Shares Acquired (in Shares) 31,750     100,000
Percentage Of Outstanding Shares Of Voting Common Stock 9.00%      
Cost Method Investments $ 711,000      
Public Fund Deposits [Member]        
Note 4 - Investment Securities (Details) [Line Items]        
Available-for-sale Securities, Amortized Cost Basis   44,600,000    
Available-for-sale Securities   44,400,000    
Municipal Notes [Member]        
Note 4 - Investment Securities (Details) [Line Items]        
Available-for-sale Securities, Amortized Cost Basis   49,527,000 32,178,000  
Available-for-sale Securities   50,839,000 33,342,000  
Available-for-sale Securities, Gross Realized Gains     98,000  
Available-for-sale Securities, Gross Realized Losses     31,000  
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]        
Note 4 - Investment Securities (Details) [Line Items]        
Available-for-sale Securities, Amortized Cost Basis   42,158,000 32,135,000  
Available-for-sale Securities   42,010,000 32,296,000  
Available-for-sale Securities, Gross Realized Gains     7,000  
Available-for-sale Securities, Gross Realized Losses     3,000  
Mutual Funds [Member]        
Note 4 - Investment Securities (Details) [Line Items]        
Available-for-sale Securities, Amortized Cost Basis   118,000 2,083,000  
Available-for-sale Securities   118,000 2,083,000  
Available-for-sale Securities, Gross Realized Losses     $ 17,000  
Peoples Bancorp, Inc. [Member]        
Note 4 - Investment Securities (Details) [Line Items]        
Available-for-sale Securities   45,400,000    
Available-for-sale Securities, Gross Realized Gains (Losses), Sale Proceeds   $ 0