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Note 6 - Income Per Common Share (Tables)
9 Months Ended
Sep. 30, 2017
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
For three months ended September 30, 2017
   
For nine months ended September 30, 2017
 
   
Income
Available to Common Shareholders
   
Average
Common
Shares
Outstanding
   
Per
Common
Share
   
Income
Available to Common Shareholders
   
Average
Common
Shares
Outstanding
   
Per
Common
Share
 
Basic Income Per Common Share
  $
1,717,383
     
4,374,725
    $
0.39
    $
4,739,197
     
4,370,877
    $
1.08
 
Effect of Dilutive Securities
   
 
     
72,841
     
 
     
 
     
64,815
     
 
 
Diluted Income Per Common Share
  $
1,717,383
     
4,447,566
    $
0.39
    $
4,739,197
     
4,435,692
    $
1.07
 
   
For three months ended September 30, 2016
   
For nine months ended September 30, 2016
 
   
Income
Available to Common Shareholders
   
Average
Common
Shares
Outstanding
   
Per
Common
Share
   
Income
Available to Common Shareholders
   
Average
Common
Shares
Outstanding
   
Per
Common
Share
 
Basic Income Per Common Share
  $
1,541,907
     
4,370,700
    $
0.35
    $
4,074,664
     
4,365,835
    $
0.93
 
Effect of Dilutive Securities
   
 
     
56,853
     
 
     
 
     
53,553
     
 
 
Diluted Income Per Common Share
  $
1,541,907
     
4,427,553
    $
0.35
    $
4,074,664
     
4,419,388
    $
0.92