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Note 10 - Short-term Borrowings (Tables)
 12 Months Ended
Dec. 31, 2019
Notes Tables  
Schedule of Short-term Debt [Table Text Block]
(Dollar amounts in thousands)
  
2019
    
2018
    
2017
  
                         
Balance at year-end
   $
5,075
     $
90,398
     $
74,707
  
Average balance outstanding
    
14,808
      
42,231
      
63,910
  
Maximum month-end balance
    
92,000
      
101,857
      
114,025
  
Weighted-average rate at year-end
    
1.66
 %    
2.53
 %    
1.36
 %
Weighted-average rate during the year
    
2.49
 %    
1.99
 %    
1.18
 %