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Note 9 - Quarterly Results for 2015, 2016 and 2017 (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2017
Notes Tables  
Quarterly Financial Information [Table Text Block]
   
Quarter Ende
d
  
   
March 31
,
    
June 30
,
    
September 30
,
    
December 31
,
  
   
201
7
    
201
7
    
201
7
    
201
7
  
Net sale
s
   $
60,987
     $
65,604
     $
67,773
     $
72,450
  
Gross profi
t
   $
22,214
     $
23,374
     $
24,789
     $
25,975
  
Income before taxes on incom
e
   $
5,405
     $
5,701
     $
6,842
     $
6,834
  
Net incom
e
   $
3,835
     $
4,341
     $
4,962
     $
1,884
  
Per Share Data
:
                                
Basi
c
                                
Net earnings
   $
0.27
     $
0.30
     $
0.34
     $
0.13
  
Dilute
d
                                
Net earnings
   $
0.26
     $
0.29
     $
0.33
     $
0.12
  
Average Outstanding Shares (Basic
)
    
14,350,721
      
14,501,399
      
14,573,813
      
14,614,691
  
Average Outstanding Shares (Diluted
)
    
14,929,695
      
15,040,431
      
15,229,722
      
15,275,222
  
   
Quarter Ende
d
  
   
March 31
,
    
June 30
,
    
September 30
,
    
December 31
,
  
   
201
6
    
201
6
    
201
6
    
201
6
  
 
  
(restated
)
    
(restated
)
    
(restated
)
          
Net sale
s
   $
57,968
     $
64,660
     $
65,282
     $
64,686
  
Gross profi
t
   $
20,021
     $
21,763
     $
23,140
     $
22,058
  
Income before taxes on incom
e
   $
3,410
     $
4,615
     $
6,006
     $
5,867
  
Net incom
e
   $
2,442
     $
3,308
     $
4,447
     $
4,441
  
Per Share Data
:
                                
Basi
c
                                
Net earnings
   $
0.18
     $
0.23
     $
0.31
     $
0.31
  
Dilute
d
                                
Net earnings
   $
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 Ende
d
  
   
March 31
,
    
June 30
,
    
September 30
,
    
December 31
,
  
   
201
5
    
201
5
    
201
5
    
201
5
  
Net sale
s
   $
46,347
     $
54,116
     $
56,662
     $
53,192
  
Gross profi
t
   $
15,796
     $
18,531
     $
19,224
     $
17,882
  
Income before taxes on incom
e
   $
3,223
     $
5,394
     $
5,581
     $
4,698
  
Net incom
e
   $
2,043
     $
3,624
     $
4,031
     $
3,368
  
Per Share Data
:
                                
Basi
c
                                
Net earnings
   $
0.15
     $
0.26
     $
0.29
     $
0.24
  
Dilute
d
                                
Net earnings
   $
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