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Note 5 - Premises and Equipment, Net (Tables)
12 Months Ended
Dec. 31, 2017
Notes Tables  
Property, Plant and Equipment [Table Text Block]
   
201
7
   
201
6
 
                 
Land and improvements
  $
18,046,000
    $
17,285,000
 
Buildings
   
41,179,000
     
39,691,000
 
Furniture and equipment
   
17,398,000
     
17,195,000
 
     
76,623,000
     
74,171,000
 
Less: accumulated depreciation
   
30,589,000
     
28,715,000
 
                 
Total premises and equipment
  $
46,034,000
    $
45,456,000