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Change in accounting principle (Tables)
 9 Months Ended
Sep. 30, 2022
Change in accounting principle [Abstract]  
Financial Statement Line Items Impacted by Change in Accounting Principle
The effect of the changes made to the Company’s Condensed Consolidated Balance Sheets for the periods presented are as follows:

   
December 31, 2021
  
 
Under
FIFO Cost
    
Under
Average Cost
    
Effect
of Change
  
Inventories
  
$
7,720
    
$
7,711
    
$
(9
)
Deferred tax assets
    
5,141
      
5,143
      
2
  
Retained earnings
    
15,573
      
15,566
      
(7
)

The ending balance in retained earnings as of December 31, 2020 was adjusted from $19,718 to $19,607.

The effect of the changes made to the Company’s Condensed Consolidated Statements of Operations for the periods presented are as follows:

   
Three months ended September 30, 2021
    
Nine months ended September 30, 2021
  
 
Under
FIFO Cost
    
Under
Average Cost
    
Effect
of Change
    
Under
FIFO Cost
    
Under
Average Cost
    
Effect
of Change
  
Cost of sales
  
$
6,320
    
$
6,332
    
$
12
    
$
17,432
    
$
17,187
    
$
(245
)
Gross profit
    
4,317
      
4,305
      
(12
)
    
10,831
      
11,076
      
245
  
Operating loss
    
(1,604
)
    
(1,616
)
    
(12
)
    
(7,025
)
    
(6,780
)
    
245
  
Income (loss) before income taxes
    
471
      
459
      
(12
)
    
(5,092
)
    
(4,847
)
    
245
  
Income tax benefit
    
439
      
442
      
3
      
1,682
      
1,629
      
(53
)
Net income (loss)
    
910
      
901
      
(9
)
    
(3,410
)
    
(3,218
)
    
192
  
                                                 
Net income (loss) per common share:
                                                
Basic
  
$
0.10
    
$
0.10
    
$
–
    
$
(0.37
)
  
$
(0.35
)
  
$
0.02
  
Diluted
  
$
0.09
    
$
0.09
    
$
–
    
$
(0.37
)
  
$
(0.35
)
  
$
0.02
  
                                                 
Shares used in per-share calculation:
                                                
Basic
    
9,408
      
9,408
              
9,112
      
9,112
          
Diluted
    
9,846
      
9,846
              
9,112
      
9,112
          

The effect of the changes made to the Company’s Condensed Consolidated Statements of Comprehensive Income (loss) for the periods presented are as follows:

   
Three months ended September 30, 2021
    
Nine months ended September 30, 2021
  
 
Under
FIFO Cost
    
Under
Average Cost
    
Effect
of Change
    
Under
FIFO Cost
    
Under
Average Cost
    
Effect
of Change
  
Net income (loss)
  
$
910
    
$
901
    
$
(9
)
  
$
(3,410
)
  
$
(3,218
)
  
$
192
  
Comprehensive income (loss)
    
933
      
924
      
(9
)
    
(3,302
)
    
(3,110
)
    
192
  

The effect of the changes made to the Company’s Condensed Consolidated Statements of Cash Flows for the periods presented are as follows:

   
Nine months ended September 30, 2021
  
 
Under
FIFO Cost
    
Under
Average Cost
    
Effect
of Change
  
Net loss
  
$
(3,410
)
  
$
(3,218
)
  
$
192
  
Deferred income taxes
    
(1,573
)
    
(1,520
)
    
53
  
Inventories
    
4,922
      
4,677
      
(245
)

The effect of the changes made to the Company’s Condensed Consolidated Statements of Changes in Shareholders’ Equity for the periods presented are as follows:

   
Three months ended September 30, 2021
    
Nine months ended September 30, 2021
  
 
Under
FIFO Cost
    
Under
Average Cost
    
Effect
of Change
    
Under
FIFO Cost
    
Under
Average Cost
    
Effect
of Change
  
Equity beginning balance
  
$
26,873
    
$
26,963
    
$
90
    
$
30,236
    
$
30,125
    
$
(111
)
Retained earnings -- beginning of period
    
15,398
      
15,488
      
90
      
19,718
      
19,607
      
(111
)
Net income (loss)
    
910
      
901
      
(9
)
    
(3,410
)
    
(3,218
)
    
192
  
Retained earnings -- end of period
    
16,308
      
16,389
      
81
      
16,308
      
16,389
      
81
  
Equity ending balance
    
39,280
      
39,361
      
81
      
39,280
      
39,361
      
81