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Note 19 - Quarterly Financial Information (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2018
Notes Tables  
Quarterly Financial Information [Table Text Block]
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
  
2017   Q1   Q2   Q3   Q4
Net sales   $
37,053
     $
37,886
     $
35,684
     $
37,220
  
Gross profit    
9,516
      
9,941
      
8,193
      
7,837
  
Net income    
2,171
      
2,630
      
1,695
      
2,714
  
Basic net income per share    
0.30
      
0.36
      
0.23
      
0.38
  
Diluted net income per share    
0.30
      
0.36
      
0.23
      
0.37