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Note 4 - Income Taxes (Tables)
12 Months Ended
Dec. 31, 2023
Notes Tables  
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]
  

Year Ended December 31,

 
  

2023

  

2022

  

2021

 

Federal

 $  $  $ 

State

  210   282   162 

International

         
  $210  $282  $162 
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]
  

Year Ended December 31,

 
  

2023

  

2022

  

2021

 

Tax at federal statutory rate

  21.0%  21.0%  21.0%

State taxes, net of federal

  1.2%  3.6%  7.4%

Permanent items

  5.8%  3.7%  30.6%

Other

  (0.4%)  (0.7%)  (0.2%)

State rate change

  (1.8%)  0.5%  (0.5%)

Valuation allowance

  (26.4%)  (28.6%)  (58.8%)

Effective tax rate

  (0.6%)  (0.5%)  (0.5%)
Schedule of Deferred Tax Assets and Liabilities [Table Text Block]
  

Year Ended December 31,

 
  

2023

  

2022

  

2021

 

Net operating loss

 $105,233  $85,214  $73,436 

Stock option expense

  23,643   18,709   12,169 

Property and equipment

  (35,756)  (20,753)  (14,957)

Other

  5,536   5,920   2,845 

Less: Valuation allowance

  (98,656)  (89,090)  (73,493)

Net deferred income tax assets

 $-  $-  $-