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Note 8 - Goodwill and Other Intangibles (Details Textual) - USD ($)
12 Months Ended
Dec. 04, 2015
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2003
Goodwill, Impairment Loss   $ 0 $ 0 $ 0  
Finite-Lived Intangible Assets, Gross       1,400,000  
Amortization of Intangible Assets   $ 147,000 $ 147,000 12,000  
Peoples Bancorp, Inc [Member]          
Goodwill, Acquired During Period $ 1,100,000     $ 1,100,000  
Hometown Bancshares Incorporated [Member]          
Goodwill, Acquired During Period         $ 5,400,000