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Note 9 - Intangible Assets, Net
 9 Months Ended
Sep. 30, 2025
Notes to Financial Statements  
Intangible Assets Disclosure [Text Block]

Note 9.  Intangible Assets, net

​

Intangible assets consisted of the following for the periods indicated (in thousands):

​

  

September 30, 2025

 
  

Gross

  

Accumulated

  

Intangible

 
  

Amount

  

amortization

  

assets, net

 

Patents

 $10,192  $(6,709) $3,483 

Trademarks

  236   (79)  157 

Total intangible assets

 $10,428  $(6,788) $3,640 

 

  

December 31, 2024

 
  

Gross

  

Accumulated

  

Intangible

 
  

Amount

  

amortization

  

assets, net

 

Patents

 $9,873  $(6,355) $3,518 

Trademarks

  218   (56)  162 

Total intangible assets

 $10,091  $(6,411) $3,680 

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For the three months ended September 30, 2025 and 2024, amortization expense for intangible assets, included in general and administrative expenses on the statement of operations, was $0.1 million and $0.1 million, respectively. For the nine months ended September 30, 2025 and 2024, amortization expense for intangible assets, included in general and administrative expenses on the statement of operations, was $0.3 million and $0.3 million, respectively. The remaining weighted average amortization period for intangible assets is approximately 8.1 years.

 

On September 30, 2025, future amortization expenses for intangible assets for future periods are estimated to be (in thousands):

 

2025 (remaining 3 months)

 $113 

2026

  451 

2027

  451 

2028

  451 

2029

  451 

2030 and thereafter

  1,723 
  $3,640