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Note 13 - Quarterly Financial Data (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2018
Notes Tables  
Quarterly Financial Information [Table Text Block]
   
First
   
Second
   
Third
   
Fourth
 
20
1
8
  
Quarter
   
Quarter
   
Quarter
   
Quarter
 
Net sales
   $
20,288,918
     $
19,177,767
     $
18,887,099
     $
24,744,403
  
Gross profit
    
12,842,962
      
13,118,442
      
11,846,833
      
12,771,954
  
Net income (loss)
    
1,273,619
      
1,440,092
      
(121,534
 )    
(628,349
 )
Net income (loss) per common share:
                                
Basic
   $
0.14
     $
0.15
     $
(0.01
 )   $
(0.07
 )
Diluted
   $
0.14
     $
0.15
     $
(0.01
 )   $
(0.07
 )
Weighted average number of common shares outstanding:
                                
Basic
    
9,264,446
      
9,180,076
      
9,154,209
      
9,143,746
  
Diluted
    
9,264,811
      
9,180,727
      
9,155,031
      
9,143,746
  
   
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