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Note 22 - Quarterly Financial Data (Unaudited) (Tables)
12 Months Ended
Dec. 31, 2019
Notes Tables  
Quarterly Financial Information [Table Text Block]
   
Interest
   
Net Interest
   
Net
   
Earnings per Share
 
   
Income
   
Income
   
Income
   
Basic
   
Diluted
 
2019
                                       
First quarter
  $
38,637,000
    $
30,645,000
    $
11,824,000
    $
0.72
    $
0.72
 
Second quarter
   
39,820,000
     
31,116,000
     
11,715,000
     
0.71
     
0.71
 
Third quarter
   
40,316,000
     
31,605,000
     
12,600,000
     
0.77
     
0.77
 
Fourth quarter
   
39,564,000
     
31,168,000
     
13,317,000
     
0.81
     
0.81
 
                                         
201
8
                                       
First quarter
  $
34,981,000
    $
30,199,000
    $
10,881,000
    $
0.66
    $
0.66
 
Second quarter
   
34,319,000
     
29,225,000
     
9,446,000
     
0.57
     
0.57
 
Third quarter
   
35,486,000
     
29,840,000
     
10,123,000
     
0.61
     
0.61
 
Fourth quarter
   
37,195,000
     
30,818,000
     
11,574,000
     
0.70
     
0.70