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Note 18 - Quarterly Financial Information (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2019
Notes Tables  
Quarterly Financial Information [Table Text Block]
2019   Q1   Q2   Q3   Q4
Net sales   $
47,328
     $
51,399
     $
49,394
     $
50,260
  
Gross profit    
12,497
      
14,371
      
13,321
      
13,770
  
Net income    
3,734
      
4,598
      
5,641
      
5,777
  
Basic net income per share    
0.50
      
0.62
      
0.76
      
0.78
  
Diluted net income per share    
0.50
      
0.62
      
0.75
      
0.76
  
2018   Q1   Q2   Q3   Q4
Net sales   $
42,931
     $
49,019
     $
47,808
     $
50,697
  
Gross profit    
10,185
      
12,986
      
12,431
      
12,706
  
Net income    
1,777
      
3,990
      
4,134
      
4,410
  
Basic net income per share    
0.24
      
0.54
      
0.56
      
0.60
  
Diluted net income per share    
0.24
      
0.54
      
0.56
      
0.59