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Note 9 - Earnings Per Common Share (Tables)
 6 Months Ended
Jun. 30, 2018
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
Three Months Ended
June 30,
    
Six Months Ended
June 30,
  
                                 
   
2018
    
2017
    
2018
    
2017
  
                                 
Earnings Per Share - Basic
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Net Income
   $
394,625
     $
941,523
     $
768,377
     $
1,154,663
  
Weighted average shares of common stock outstanding - Basic
    
2,721,832
      
2,880,719
      
2,880,070
      
2,879,115
  
Earnings Per Share - Basic
   $
0.14
     $
0.33
     $
0.27
     $
0.40
  
                                 
Earnings Per Share - Diluted
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Weighted average shares of common stock outstanding - Basic
    
2,721,832
      
2,880,719
      
2,880,070
      
2,879,115
  
Warrants, Options and Convertible Notes
    
354,244
      
191,681
      
356,520
      
164,504
  
Weighted average shares of common stock -Diluted
    
3,076,076
      
3,072,400
      
3,236,590
      
3,043,619
  
Earnings Per Share - Diluted
   $
0.13
     $
0.31
     $
0.24
     $
0.38