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Quarterly results of operations (unaudited) (Tables)
 12 Months Ended
Dec. 31, 2022
Quarterly results of operations (unaudited) [Abstract]  
Quarterly Results of Operations
Our quarterly results of operations for 2022 and 2021 are as follows:

  
Quarter Ended
  
(In thousands, except per share amounts)
  
March 31
    
June 30
    
September 30
    
December 31
  
2022:
                        
Net sales
  
$
9,702
    
$
12,623
    
$
17,856
    
$
17,958
  
Gross profit
    
2,566
      
5,434
      
8,193
      
8,219
  
Net (loss) income
    
(4,348
)
    
(2,376
)
    
528
      
260
  
Net (loss) income per common share:
                                
Basic
    
(0.44
)
    
(0.24
)
    
0.05
      
0.03
  
Diluted
    
(0.44
)
    
(0.24
)
    
0.05
      
0.03
  
                                 
2021:
                                
Net sales
  
$
8,301
    
$
9,325
    
$
10,637
    
$
11,123
  
Gross profit
    
3,339
      
3,432
      
4,305
      
4,306
  
Net (loss) income
    
(2,089
)
    
(2,030
)
    
901
      
(823
)
Net (loss) income per common share:
                                
Basic
    
(0.23
)
    
(0.23
)
    
0.10
      
(0.08
)
Diluted
    
(0.23
)
    
(0.23
)
    
0.09
      
(0.08
)