v3.25.4
Note 15 - Income Taxes (Tables)
12 Months Ended
Dec. 31, 2025
Notes Tables  
Schedule of Income before Income Tax, Domestic and Foreign [Table Text Block]
  

Year Ended December 31,

 
  

2025

  

2024

 

Domestic

 $(22,248) $(27,044)

International

  (10,030)  (11,922)

Loss before income taxes

 $(32,278) $(38,966)
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]
  Year Ended December 31, 
  

2025

  

2024

 

Current:

        

Federal

 $  $5 

State

  (8)  (13)

Foreign

  (23)  (36)

Sub-total

 $(31) $(44)

Deferred:

        

Federal

 $  $ 

State

      

Foreign

      

Sub-total

 $  $ 

Total

 $(31) $(44)
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]
  Year Ended      Year Ended     
  

December 31,

      

December 31,

     
  

2025

  

%

  

2024

  

%

 

Income taxes computed at U.S. statutory rates

 $6,778   21% $8,183   21%

State income taxes, net of federal tax benefit

  (7)  %  (10)  %

(Increases) decreases resulting from:

                

Foreign tax effects:

                

United Kingdom:

                

Change in valuation allowance

  (2,513)  (8)%  (2,443)  (6)%

Statutory rate differential

  407   1%  615   2%

Research and development tax deductions and credits

  25   %  650   2%

NOLs surrendered for refundable tax credit

     %  (1,355)  (3)%

Other

  (54)  %  3   %

Other foreign jurisdictions

  6   %  (9)  %

Tax credits:

                

Research and development tax credits

  832   3%  1,373   4%

Nontaxable or nondeductible items:

                

Stock compensation expense windfall (shortfall)

  (542)  (2)%  171   1%

Other

  (270)  (1)%  (56)  %

Change in valuation allowance

  (4,860)  (15)%  (7,001)  (18)%

Change in unrecognized tax benefits

  (96)  %  (74)  %

Other

  263   1%  (91)  %

Total

 $(31)  % $(44)  %
Schedule of Deferred Tax Assets and Liabilities [Table Text Block]
  

December 31,

  

December 31,

 
  

2025

  

2024

 

Deferred tax assets:

        

Federal and state net operating losses

 $88,985  $79,856 

Federal and state research and experimentation credits

  14,626   13,610 

Research and experimental costs

  9,464   12,806 

Stock based compensation

  2,289   1,822 

ASC 842 - lease liabilities

  1,125   1,303 

Accrued compensation

  270   324 

Fixed asset differences

  220   191 

Intangible asset differences

  3   4 

Other

  182   264 

Total gross deferred tax assets

  117,164   110,180 

Less valuation allowance

  (112,746)  (104,361)

Net deferred tax assets

 $4,418  $5,819 
         

Deferred tax liabilities:

        

Patent expenditures

 $(808) $(888)

ASC 842 - right of use assets

  (699)  (795)

Fixed asset differences

  (1)  (4)

Intangible asset differences

  (2,910)  (4,132)

Total gross deferred tax liabilities

 $(4,418) $(5,819)

Total net deferred tax assets and liabilities

 $  $ 
Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block]
  Year Ended December 31, 
  

2025

  

2024

 

Beginning balance

 $1,137  $1,063 

Addition for current year tax positions

  66   85 

Addition (reduction) for prior year positions

  30   (11)

Ending balance

 $1,233  $1,137