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Note 10 - Earnings Per Common Share (Tables)
 6 Months Ended
Jun. 30, 2019
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
Three Months Ended
June 30,
    
Six Months Ended
June 30,
  
                                 
   
201
9
    
201
8
    
201
9
    
201
8
  
                                 
Earnings Per Share - Basic
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Net Income
   $
1,831,479
     $
394,625
     $
3,576,937
     $
768,377
  
Weighted average shares of common stock outstanding - Basic
    
2,755,916
      
2,721,832
      
2,755,764
      
2,880,070
  
Earnings Per Share - Basic
   $
0.66
     $
0.14
     $
1.30
     $
0.27
  
                                 
Earnings Per Share - Diluted
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Weighted average shares of common stock outstanding - Basic
    
2,755,916
      
2,721,832
      
2,755,764
      
2,880,070
  
Warrants, Options and Convertible Notes
    
456,882
      
354,244
      
440,387
      
356,520
  
Weighted average shares of common stock -Diluted
    
3,212,798
      
3,076,076
      
3,196,151
      
3,236,590
  
Earnings Per Share - Diluted
   $
0.57
     $
0.13
     $
1.12
     $
0.24