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Earnings per share
 9 Months Ended
Sep. 30, 2021
Earnings per share [Abstract]  
Earnings per share
7. Earnings per share

The following table sets forth the reconciliation of basic weighted average shares outstanding and diluted weighted average shares outstanding:

   
Three Months Ended
    
Nine Months Ended
  
 
September 30,
    
September 30,
  
   
2021
    
2020
    
2021
    
2020
  
   
(In thousands, except per share data)
  
Net income (loss)
  
$
910
    
$
(867
)
  
$
(3,410
)
  
$
(3,712
)
                                 
Shares:
                                
Basic:  Weighted average common shares outstanding
    
9,408
      
7,548
      
9,112
      
7,533
  
Add:  Dilutive effect of outstanding options and restricted stock units as determined by the treasury stock method
    
438
      
–
      
–
      
–
  
Diluted:  Weighted average common and common equivalent shares outstanding
    
9,846
      
7,548
      
9,112
      
7,533
  
                                 
Net income (loss) per common share:
                                
Basic
  
$
0.10
    
$
(0.11
)
  
$
(0.37
)
  
$
(0.49
)
Diluted
  
$
0.09
    
$
(0.11
)
  
$
(0.37
)
  
$
(0.49
)

The computation of diluted earnings per share excludes the effect of the potential exercise of stock awards, including stock options and restricted stock units, when the average market price of the common stock is lower than the exercise price of the related stock award during the period, as the inclusion of these stock awards in the computation of diluted earnings would be anti-dilutive.  For the three months ended September 30, 2021 and 2020, there were 0.3 million and 1.4 million, respectively, of potentially dilutive shares consisting of stock awards that were excluded from the calculation of earnings per diluted share.  For the nine months ended September 30, 2021 and 2020, there were 0.4 million and 1.4 million, respectively, of potentially dilutive shares consisting of stock awards that were excluded from the calculation of earnings per diluted share.  Regarding the three months ended September, 31, 2020 and the nine months ended September 30, 2021 and 2020, when a net loss is reported, basic and diluted net loss per common share are calculated using the same method.