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Note 4 - Investment Securities (Details Textual)
1 Months Ended 12 Months Ended
Jul. 31, 2016
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
shares
Available-for-sale Securities Pledged as Collateral, Amortized Cost   $ 47,700,000    
Available-for-sale Securities Pledged as Collateral   $ 47,600,000    
Number of Holdings of Securities with an Aggregate Book Value Greater than 10% of Stockholders' Equity   0 0  
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value   $ 0 $ 0  
Available-for-Sale, Securities in Unrealized Loss Positions, Depreciation from Amortized Cost Percentage   1.80%    
Available-for-sale Securities, Gross Realized Gains   $ 61,000 176,000 $ 0
Available-for-sale Securities, Gross Realized Losses   7,000 0 0
Available-for-sale Securities   271,172,000 255,770,000  
Available-for-sale Securities, Gross Realized Gain (Loss)   54,000 176,000
Cost Method Investments, Number of Shares Held | shares       131,750
Percentage of Outstanding Shares of Voting Common Stock       9.00%
Proceeds from Sale of Cost Method Equity Investment $ 856,000 $ 856,000
Cost-method Investments, Realized Gains $ 145,000      
Other Assets [Member]        
Cost Method Investments       711,000
Peoples Bancorp, Inc [Member]        
Available-for-sale Securities       45,400,000
Available-for-sale Securities, Gross Realized Gain (Loss)       $ 0