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Note 14 - Quarterly Financial Data (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2017
Notes Tables  
Quarterly Financial Information [Table Text Block]
   
First
   
Second
   
Third
   
Fourth
 
20
1
7
  
Quarter
   
Quarter
   
Quarter
   
Quarter
 
Net sales
   $
20,149,845
     $
19,280,770
     $
18,388,381
     $
24,502,272
  
Gross profit
    
12,286,045
      
12,895,534
      
11,635,331
      
15,296,919
  
Net income
    
1,231,265
      
1,027,732
      
521,414
      
1,671,340
  
Net income per common share:
                                
Basic
   $
0.13
     $
0.11
     $
0.06
     $
0.18
  
Diluted
   $
0.13
     $
0.11
     $
0.06
     $
0.18
  
Weighted average number of common shares outstanding:
                                
Basic
    
9,308,726
      
9,225,960
      
9,270,862
      
9,270,862
  
Diluted
    
9,330,919
      
9,229,129
      
9,273,950
      
9,272,330
  
   
First
   
Second
   
Third
   
Fourth
 
20
1
6
  
Quarter
   
Quarter
   
Quarter
   
Quarter
 
Net sales
   $
20,672,227
     $
19,552,905
     $
18,628,362
     $
24,100,498
  
Gross profit
    
12,652,746
      
12,895,790
      
11,644,871
      
14,519,835
  
Net income
    
1,520,997
      
1,820,915
      
1,000,350
      
2,059,997
  
Net income per common share:
                                
Basic
   $
0.16
     $
0.19
     $
0.11
     $
0.23
  
Diluted
   $
0.16
     $
0.19
     $
0.11
     $
0.23
  
Weighted average number of common shares outstanding:
                                
Basic
    
9,698,951
      
9,209,446
      
9,188,483
      
9,188,483
  
Diluted
    
9,718,453
      
9,227,941
      
9,206,382
      
9,301,867