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Quarterly results of operations (unaudited) (Tables)
 12 Months Ended
Dec. 31, 2024
Quarterly results of operations (unaudited) [Abstract]  
Quarterly Results of Operations
Our quarterly results of operations for 2024 and 2023 are as follows:

 
Quarter Ended
  
(In thousands, except per share amounts)
  
March 31
    
June 30
    
September 30
    
December 31
  
2024:
                        
Net sales
  
$
10,687
    
$
11,599
    
$
10,867
    
$
10,231
  
Gross profit
    
5,624
      
6,110
      
5,227
      
4,521
  
Net loss
    
(1,036
)
    
(319
)
    
(551
)
    
(7,957
)
Net loss per common share:
                                
Basic
    
(0.10
)
    
(0.03
)
    
(0.06
)
    
(0.79
)
Diluted
    
(0.10
)
    
(0.03
)
    
(0.06
)
    
(0.79
)
                                 
2023:
                                
Net sales
  
$
22,270
    
$
19,906
    
$
17,190
    
$
13,265
  
Gross profit
    
12,255
      
10,858
      
8,916
      
6,371
  
Net income (loss)
    
3,139
      
765
      
906
      
(62
)
Net income (loss) per common share:
                                
Basic
    
0.32
      
0.08
      
0.09
      
(0.01
)
Diluted
    
0.31
      
0.08
      
0.09
      
(0.01
)