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Note 18 - Quarterly Financial Information (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2017
Notes Tables  
Quarterly Financial Information [Table Text Block]
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
  
2016   Q1   Q2   Q3   Q4
Net sales   $
34,503
     $
37,902
     $
37,220
     $
36,507
  
Gross profit    
7,727
      
10,295
      
8,452
      
8,176
  
Net income    
1,075
      
2,735
      
2,669
      
1,491
  
Basic net income per share    
0.15
      
0.38
      
0.37
      
0.21
  
Diluted net income per share    
0.15
      
0.38
      
0.37
      
0.20