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Note 4 - Income Taxes (Tables)
12 Months Ended
Dec. 31, 2022
Notes Tables  
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]
  

Year Ended December 31,

 
  

2022

  

2021

  

2020

 

Federal

 $  $  $ 

State

  282   162   65 

International

         
  $282  $162  $65 
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]
  

Year Ended December 31,

 
  

2022

  

2021

  

2020

 

Tax at federal statutory rate

  21.0%  21.0%  21.0%

State taxes, net of federal

  3.6%  7.4%  39.2%

Permanent items

  3.7%  30.6%  284.4%

Other

  (0.7%)  (0.2%)  5.6%

State rate change

  0.5%  (0.5%)  0.2%

Valuation allowance

  (28.6%)  (58.8%)  (352.5%)

Effective tax rate

  (0.5%)  (0.5%)  (2.1%)
Schedule of Deferred Tax Assets and Liabilities [Table Text Block]
  

Year Ended December 31,

 
  

2022

  

2021

  

2020

 

Net operating loss

 $85,214  $73,436  $60,268 

Stock option expense

  18,709   12,169   6,454 

Property and equipment

  (20,753)  (14,957)  (11,941)

Other

  5,920   2,845   1,194 

Less: Valuation allowance

  (89,090)  (73,493)  (55,975)

Net deferred income tax assets

 $-  $-  $-