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Change in accounting principle (Tables)
 6 Months Ended
Jun. 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 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 follows:

   
Three months ended March 31, 2022
    
Three months ended June 30, 2021
  
 
Under
FIFO Cost
    
Under
Average Cost
    
Effect
of Change
    
Under
FIFO Cost
    
Under
Average Cost
    
Effect
of Change
  
Cost of sales
  
$
6,708
    
$
7,136
    
$
428
    
$
6,000
    
$
5,893
    
$
(107
)
Gross profit
    
2,994
      
2,566
      
(428
)
    
3,325
      
3,432
      
107
  
Operating loss
    
(5,176
)
    
(5,604
)
    
(428
)
    
(2,755
)
    
(2,648
)
    
107
  
Loss before income taxes
    
(5,275
)
    
(5,703
)
    
(428
)
    
(2,801
)
    
(2,694
)
    
107
  
Income tax benefit
    
1,262
      
1,355
      
93
      
687
      
664
      
(23
)
Net loss
    
(4,013
)
    
(4,348
)
    
(335
)
    
(2,114
)
    
(2,030
)
    
84
  
                                                 
Net loss per common share:
                                                
Basic
  
$
(0.41
)
  
$
(0.44
)
  
$
(0.03
)
  
$
(0.24
)
  
$
(0.23
)
  
$
0.01
  
Diluted
  
$
(0.41
)
  
$
(0.44
)
  
$
(0.03
)
  
$
(0.24
)
  
$
(0.23
)
  
$
0.01
  
                                                 
Shares used in per-share calculation:
                                                
Basic
    
9,886
      
9,886
              
8,976
      
8,976
          
Diluted
    
9,886
      
9,886
              
8,976
      
8,976
          

   
Six months ended June 30, 2021
  
 
Under
FIFO Cost
    
Under
Average Cost
    
Effect
of Change
  
Cost of sales
  
$
11,112
    
$
10,855
    
$
(257
)
Gross profit
    
6,514
      
6,771
      
257
  
Operating loss
    
(5,421
)
    
(5,164
)
    
257
  
Loss before income taxes
    
(5,563
)
    
(5,306
)
    
257
  
Income tax benefit
    
1,243
      
1,187
      
(56
)
Net loss
    
(4,320
)
    
(4,119
)
    
201
  
                         
Net loss per common share:
                        
Basic
  
$
(0.48
)
  
$
(0.46
)
  
$
0.02
  
Diluted
  
$
(0.48
)
  
$
(0.46
)
  
$
0.02
  
                         
Shares used in per-share calculation:
                        
Basic
    
8,962
      
8,962
          
Diluted
    
8,962
      
8,962
          

The effect of the changes made to the Company’s Condensed Consolidated Statements of Comprehensive Loss follows:

   
Three months ended March 31, 2022
    
Three months ended June 30, 2021
  
 
Under
FIFO Cost
    
Under
Average Cost
    
Effect
of Change
    
Under
FIFO Cost
    
Under
Average Cost
    
Effect
of Change
  
Net loss
  
$
(4,013
)
  
$
(4,348
)
  
$
(335
)
  
$
(2,114
)
  
$
(2,030
)
  
$
84
  
Comprehensive loss
    
(4,055
)
    
(4,390
)
    
(335
)
    
(2,082
)
    
(1,998
)
    
84
  

   
Six months ended June 30, 2021
  
 
Under
FIFO Cost
    
Under
Average Cost
    
Effect
of Change
  
Net loss
  
$
(4,320
)
  
$
(4,119
)
  
$
201
  
Comprehensive loss
    
(4,235
)
    
(4,034
)
    
201
  

The effect of the changes made to the Company’s Condensed Consolidated Statements of Cash Flows follows:

   
Three months ended March 31, 2022
    
Six months ended June 30, 2021
  
 
Under
FIFO Cost
    
Under
Average Cost
    
Effect
of Change
    
Under
FIFO Cost
    
Under
Average Cost
    
Effect
of Change
  
Net loss
  
$
(4,013
)
  
$
(4,348
)
  
$
(335
)
  
$
(4,320
)
  
$
(4,119
)
  
$
201
  
Deferred income taxes
    
(1,262
)
    
(1,355
)
    
(93
)
    
(1,209
)
    
(1,153
)
    
56
  
Inventories
    
(1,344
)
    
(916
)
    
428
      
2,591
      
2,334
      
(257
)

The effect of the changes made to the Company’s Condensed Consolidated Statements of Changes in Shareholders’ Equity follows:

   
Three months ended March 31, 2022
    
Three months ended June 30, 2021
  
 
Under
FIFO Cost
    
Under
Average Cost
    
Effect
of Change
    
Under
FIFO Cost
    
Under
Average Cost
    
Effect
of Change
  
Equity beginning balance
  
$
38,991
    
$
38,984
    
$
(7
)
  
$
28,363
    
$
28,369
    
$
6
  
Retained earnings -- beginning of period
    
15,573
      
15,566
      
(7
)
    
17,512
      
17,518
      
6
  
Net loss
    
(4,013
)
    
(4,348
)
    
(335
)
    
(2,114
)
    
(2,030
)
    
84
  
Retained earnings -- end of period
    
11,560
      
11,218
      
(342
)
    
15,398
      
15,488
      
90
  
Equity ending balance
    
35,113
      
34,771
      
(342
)
    
26,873
      
26,963
      
90
  

   
Six months ended June 30, 2021
  
 
Under
FIFO Cost
    
Under
Average Cost
    
Effect
of Change
  
Equity beginning balance
  
$
30,236
    
$
30,125
    
$
(111
)
Retained earnings -- beginning of period
    
19,718
      
19,607
      
(111
)
Net loss
    
(4,320
)
    
(4,119
)
    
201
  
Retained earnings -- end of period
    
15,398
      
15,488
      
90
  
Equity ending balance
    
26,873
      
26,963
      
90