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Quarterly results of operations (unaudited) (Tables)
 12 Months Ended
Dec. 31, 2019
Quarterly results of operations (unaudited) [Abstract]  
Quarterly results of operations
Our quarterly results of operations for 2019 and 2018 are as follows:

 
 
Quarter Ended
 
(In thousands, except per share amounts)
 
March 31
  
June 30
  
September 30
  
December 31
 
2019:
            
Net sales
 
$
11,550
  
$
11,350
  
$
11,686
  
$
11,162
 
Gross profit
  
6,086
   
5,704
   
5,546
   
4,599
 
Net income (loss)
  
746
   
186
   
384
   
(800
)
Net income (loss) per common share:
                
Basic
  
0.10
   
0.02
   
0.05
   
(0.11
)
Diluted
  
0.10
   
0.02
   
0.05
   
(0.11
)

2018:
            
Net sales
 
$
12,243
  
$
14,751
  
$
15,838
  
$
11,755
 
Gross profit
  
5,862
   
6,991
   
8,004
   
5,886
 
Net income
  
680
   
1,210
   
2,574
   
962
 
Net income per common share:
                
Basic
  
0.09
   
0.16
   
0.35
   
0.13
 
Diluted
  
0.09
   
0.16
   
0.33
   
0.12