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Note 17 - Quarterly Data (Unaudited) (Tables)
 3 Months Ended
Dec. 31, 2017
Notes Tables  
Quarterly Financial Information [Table Text Block]
   
September 30,
2017
    
June 30,
2017
    
March 31,
2017
    
December 31,
2016
    
September 30,
2016
    
June 30,
2016
    
March 31,
2016
    
December 31,
2015
  
                                                                 
Net Sales
  $
10,892,868
     $
7,220,626
     $
3,346,315
     $
2,356,926
     $
2,692,040
     $
1,530,244
     $
1,046,624
     $
1,376,872
  
Gross Profit
   $
3,034,379
     $
3,029,146
      
1,377,514
      
583,238
      
561,720
      
760,244
      
352,080
      
636,351
  
Net Income (Loss)
    
567,439
      
941,523
      
213,140
      
(313,706
)
    
5,152,576
      
(8,095
)
    
(464,444
)
    
(47,189
)
Net Income (Loss) per Common Share:
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Basic
   $
0.20
     $
0.33
     $
0.07
     $
(0.11
)
   $
1.81
     $
(0.01
)
   $
(0.28
)
   $
(0.03
)
Diluted
   $
0.18
     $
0.31
     $
0.07
     $
(0.11
)
   $
1.77
     $
(0.01
)
   $
(0.28
)
   $
(0.03
)