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Income taxes (Tables)
12 Months Ended
Dec. 31, 2022
Income Tax Disclosure [Abstract]  
Provision for income taxes
        
   For the Years Ended December 31, 
   2022   2021 
Current:        
Federal  $645   $1,097 
State and local   444    951 
Total current   1,089    2,048 
Deferred   (172)   257 
Provision for income taxes  $917   $2,305 
Reconciliation to effective rate for income taxes
                
   2022   2021 
   Amount   Percentage   Amount   Percentage 
Federal income tax at statutory rate  $392    21.0%   $1,179    21.0% 
State and local tax, net   287    15.4%    440    7.8% 
Other permanent differences   8    0.4%    6    0.1% 
Section 162m   229    12.2%    206    3.7% 
Stock based compensation   127    6.8%    100    1.8% 
Uncertain tax positions       %    218    3.9% 
Change in tax rates   (83)   (4.4%)   198    3.4% 
Other   (43)   (2.3%)   (42)   (0.7%)
Provision for income taxes  $917    49.1%   $2,305    41.0% 
Schedule of deferred tax assets and liabilities
        
   December 31, 
   2022   2021 
Deferred tax liabilities attributable to:          
Accumulated depreciation and amortization  $(3,394)  $(3,401)
Unrealized gains   (472)   (473)
Total deferred tax liabilities   (3,866)   (3,874)
Deferred tax assets attributable to:          
Net operating losses   6    6 
Accrued compensation   287    170 
Incentive compensation   194    164 
Inventory   328    324 
Allowances for doubtful accounts and discounts   5    5 
Deferred revenue       10 
Other   17    (6)
Total net deferred tax assets   837    673 
Net deferred tax liabilities  $(3,029)  $(3,201)
Schedule of tax attributes related to net operating losses
                 
Tax Attributes   Gross Amount     Net Amount     Expiration Years  
State net operating losses   $ 116     $ 6       2035  
            $ 6          
Reconciliation of amount of unrecognized tax benefits
        
   2022   2021 
Balance at January 1  $396   $95 
Additions based on tax positions of prior years       301 
Settlement for tax positions of prior years   (396)    
Balance at December 31  $   $396