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Note 9 - Earnings Per Common Share (Tables)
 9 Months Ended
Sep. 30, 2018
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
Three Months Ended
September
30,
    
Nine
Months Ended
September
30,
  
                                 
   
2018
    
2017
    
2018
    
2017
  
                                 
Earnings Per Share - Basic
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Net Income
   $
1,497,079
     $
567,439
     $
2,265,456
     $
1,722,102
  
Weighted average shares of common stock outstanding - Basic
    
2,720,654
      
2,888,502
      
2,826,347
      
2,882,278
  
Earnings Per Share - Basic
   $
0.55
     $
0.20
     $
0.80
     $
0.60
  
                                 
Earnings Per Share - Diluted
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Weighted average shares of common stock outstanding - Basic
    
2,720,654
      
2,888,502
      
2,826,347
      
2,882,278
  
Warrants, Options and Convertible Notes
    
371,866
      
273,473
      
360,599
      
218,738
  
Weighted average shares of common stock -Diluted
    
3,092,520
      
3,161,975
      
3,186,946
      
3,101,016
  
Earnings Per Share - Diluted
   $
0.48
     $
0.18
     $
0.71
     $
0.56