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Note 6 - Income Per Common Share (Tables)
3 Months Ended
Mar. 31, 2018
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
For three months ended March 31, 2018
 
   
Income Available
to Common
Stockholders
   
Weighted Average Common Shares Outstanding
   
Per Common
Share
 
Basic Income per Common Share
  $
1,355,745
     
4,391,717
    $
0.31
 
Effect of Dilutive Securities
   
 
     
75,069
     
 
 
Diluted Income per Common Share
  $
1,355,745
     
4,466,786
    $
0.30
 
   
For three months ended March 31, 2017
 
   
Income Available
to Common
Stockholders
   
Weighted Average Common Shares Outstanding
   
Per Common
Share
 
Basic Income per Common Share
  $
1,429,241
     
4,363,071
    $
0.33
 
Effect of Dilutive Securities
   
 
     
56,952
     
 
 
Diluted Income per Common Share
  $
1,429,241
     
4,420,023
    $
0.32