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Note 10 - Earnings Per Common Share (Tables)
 6 Months Ended
Jun. 30, 2020
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
Three Months Ended
June 30,
    
Six Months Ended
June 30,
  
                                 
   
20
20
    
201
9
    
20
20
    
201
9
  
                                 
Earnings Per Share - Basic
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Net Income
   $
228,837
     $
1,831,479
     $
2,304,407
     $
3,576,937
  
Weighted average shares of common stock outstanding - Basic
    
3,317,665
      
2,755,916
      
3,314,573
      
2,755,764
  
Earnings Per Share - Basic
   $
0.07
     $
0.66
     $
0.70
     $
1.30
  
                                 
Earnings Per Share - Diluted
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Weighted average shares of common stock outstanding - Basic
    
3,317,665
      
2,755,916
      
3,314,573
      
2,755,764
  
Warrants, Options and Convertible Notes
    
1,599
      
456,882
      
1,644
      
440,387
  
Weighted average shares of common stock -Diluted
    
3,319,264
      
3,212,798
      
3,316,217
      
3,196,151
  
Earnings Per Share - Diluted
   $
0.07
     $
0.57
     $
0.69
     $
1.12