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Note 16 - 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

 

Current tax benefit

  $ -     $ -  

Deferred tax benefit

    3,756       6,409  

Change in valuation allowance

    (3,756 )     (6,409 )

Income tax benefit (provision)

  $ -     $ -  
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]
   

Year Ended December 31,

 
   

2022

   

2021

 

Income taxes benefit computed at federal statutory rate

  $ 3,700     $ 5,139  

State income taxes, net of federal effect

    345       480  

Permanent differences and other

    (289 )     790  

Change in valuation allowance

    (3,756 )     (6,409 )

Income tax benefit (provision)

  $ -     $ -  
Schedule of Deferred Tax Assets and Liabilities [Table Text Block]
   

December 31,

 
   

2022

   

2021

 

Deferred tax assets:

               

Net operating losses

  $ 14,898     $ 11,773  

Research tax credits

    65       60  

Stock compensation

    1,216       847  

Accruals and other

    324       211  
      16,503       12,891  

Deferred tax liabilities:

               

Depreciation and other

    534       678  
      534       678  

Net deferred tax assets

    15,969       12,213  

Less valuation allowance

    (15,969 )     (12,213 )

Net deferred taxes after valuation allowance

  $ -     $ -