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Note 9 - Quarterly Results for 2014, 2015 and 2016 (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2016
Notes Tables  
Quarterly Financial Information [Table Text Block]
 
 
Quarter Ended
 
   
March 31,
    
June 30,
    
September 30,
    
December 31,
  
   
2016
    
2016
    
2016
    
2016
  
   
(restated)
    
(restated)
    
(restated)
          
Net sales
   $
57,968,000
    $
64,660,000
    $
65,282,000
    $
64,686,000
 
Gross profit
   $
20,021,000
    $
21,763,000
    $
23,140,000
    $
22,058,000
 
Income before taxes on income
   $
3,410,000
    $
4,615,000
    $
6,006,000
    $
5,867,000
 
Net income
   $
2,442,000
    $
3,308,000
    $
4,447,000
    $
4,441,000
 
Per Share Data:
                                
Basic
                                
Net income
   $
0.18
    $
0.23
    $
0.31
    $
0.31
 
Diluted
                                
Net income
   $
0.17
    $
0.22
    $
0.30
    $
0.30
 
Average Outstanding Shares (Basic)
    
13,927,063
     
14,120,617
     
14,118,354
     
14,162,939
 
Average Outstanding Shares (Diluted)
    
14,668,658
     
14,957,469
     
14,984,084
     
14,979,746
 
   
Quarter Ended
  
   
March 31,
    
June 30,
    
September 30,
    
December 31,
  
   
2015
    
2015
    
2015
    
2015
  
Net sales
   $
46,347,000
    $
54,116,000
    $
56,662,000
    $
53,192,000
 
Gross profit
   $
15,796,000
    $
18,531,000
    $
19,224,000
    $
17,882,000
 
Income before taxes on income
   $
3,223,000
    $
5,394,000
    $
5,581,000
    $
4,698,000
 
Net income
   $
2,043,000
    $
3,624,000
    $
4,031,000
    $
3,368,000
 
Per Share Data:
                                
Basic
                                
Net income
   $
0.15
    $
0.26
    $
0.29
    $
0.24
 
Diluted
                                
Net income
   $
0.14
    $
0.25
    $
0.28
    $
0.23
 
Average Outstanding Shares (Basic)
    
13,584,922
     
13,730,646
     
13,833,561
     
13,894,907
 
Average Outstanding Shares (Diluted)
    
14,548,084
     
14,577,342
     
14,585,688
     
14,603,464
 
   
Quarter Ended
  
   
March 31,
    
June 30,
    
September 30,
    
December 31,
  
   
2014
    
2014
    
2014
    
2014
  
Net sales
   $
41,027,000
    $
53,230,000
    $
52,291,000
    $
49,701,000
 
Gross profit
   $
14,056,000
    $
19,006,000
    $
18,433,000
    $
17,242,000
 
Income before taxes on income
   $
1,878,000
    $
5,867,000
    $
5,168,000
    $
4,616,000
 
Net income
   $
1,218,000
    $
3,907,000
    $
3,368,000
    $
2,856,000
 
Per Share Data:
                                
Basic
                                
Net income
   $
0.09
    $
0.30
    $
0.25
    $
0.21
 
Diluted
                                
Net income
   $
0.09
    $
0.29
    $
0.24
    $
0.20
 
Average Outstanding Shares (Basic)
    
13,128,946
     
13,207,804
     
13,375,566
     
13,481,494
 
Average Outstanding Shares (Diluted)
    
13,553,740
     
13,648,540
     
14,004,202
     
14,252,310