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Note 11 - Borrowings (Tables)
 12 Months Ended
Dec. 31, 2018
Notes Tables  
Schedule of Federal Home Loan Bank, Advances, by Branch of FHLB Bank [Table Text Block]
   
December 31, 2018
    
December 31, 2017
  
Maturity Date
  
Amount
    
Weighted
Average Rate
    
Amount
    
Weighted
Average Rate
  
2019
    
105,300,000
      
2.69
 %    
92,200,000
      
1.90
 %
2020
    
-
      
0.00
 %    
2,100,000
      
4.87
 %
2021
    
-
      
0.00
 %    
-
      
0.00
 %
    $
105,300,000
      
2.69
 %   $
94,300,000
      
1.97
 %