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Note 4 - Income Taxes (Tables)
12 Months Ended
Dec. 31, 2021
Notes Tables  
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]
  

Year Ended December 31,

 
  

2021

  

2020

  

2019

 

Federal

 $  $  $ 

State

  162   65   144 

International

         
  $162  $65  $144 
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]
  

Year Ended December 31,

 
  

2021

  

2020

  

2019

 

Tax at federal statutory rate

  21.0%  21.0%  21.0%

State taxes, net of federal

  7.4%  39.2%  36.6%

Permanent items

  30.6%  284.4%  312.2%

Other

  (0.2%)  5.6%  5.6%

State rate change

  (0.5%)  0.2%  (24.3%)

Valuation allowance

  (58.8%)  (352.5%)  (362.7%)

Effective tax rate

  (0.5%)  (2.1%)  (11.6%)
Schedule of Deferred Tax Assets and Liabilities [Table Text Block]
  

Year Ended December 31,

 
  

2021

  

2020

  

2019

 

Net operating loss

 $73,436  $60,268  $49,626 

Stock option expense

  12,169   6,454   5,063 

Property and equipment

  (14,957)  (11,941)  (10,372)

Other

  2,845   1,194   966 

Less: Valuation allowance

  (73,493)  (55,975)  (45,283)

Net deferred income tax assets

 $-  $-  $-