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Note 9 - Quarterly Results for 2019 and 2018 (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2019
Notes Tables  
Quarterly Financial Information [Table Text Block]
   
Quarters Ended
  
   
March 31, 2019
    
June 30, 2019
    
September 30, 2019
    
December 31, 2019
  
Net sales
   $
86,552
     $
92,270
     $
89,466
     $
108,413
  
Gross profit
    
30,268
      
32,343
      
31,451
      
34,867
  
Income before taxes on income
    
2,976
      
3,652
      
4,630
      
4,028
  
Net income
    
2,376
      
2,781
      
3,921
      
2,988
  
Net income per share:
                                
Basic
   $
0.16
     $
0.19
     $
0.26
     $
0.20
  
Diluted
   $
0.16
     $
0.18
     $
0.26
     $
0.20
  
                                 
Average Outstanding Shares (Basic)
    
14,927,341
      
14,952,802
      
14,947,552
      
14,952,963
  
Average Outstanding Shares (Diluted)
    
15,262,654
      
15,287,357
      
15,266,850
      
15,248,770
  
   
Quarters Ended
  
   
March 31, 2018
    
June 30, 2018(1)
    
September 30, 2018
    
December 31, 2018
  
Net sales
   $
73,087
     $
82,392
     $
95,870
     $
95,001
  
Gross profit
    
24,875
      
29,278
      
33,800
      
33,744
  
Income before taxes on income
    
3,320
      
5,097
      
7,282
      
5,696
  
Net income
    
2,450
      
3,817
      
6,122
      
4,586
  
Net income per share:
                                
Basic
   $
0.17
     $
0.26
     $
0.41
     $
0.31
  
Diluted
   $
0.16
     $
0.25
     $
0.39
     $
0.30
  
                                 
Average Outstanding Shares (Basic)
    
14,821,659
      
14,956,221
      
15,010,660
      
14,962,603
  
Average Outstanding Shares (Diluted)
    
15,457,629
      
15,559,404
      
15,499,894
      
15,371,606