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Note 16 - Stock-based Compensation (Tables)
9 Months Ended
Sep. 30, 2025
Notes Tables  
Disclosure of Share-Based Compensation Arrangements by Share-Based Payment Award [Table Text Block]

(in whole numbers)

            

Stock Options

 

Shares

  

Weighted- Average Exercise Price

  

Weighted- Average Remaining Contractual Term (In Yrs)

 
             

Outstanding at January 1, 2025

  290  $77,533     

Forfeited or expired

  (123)  70,174     

Outstanding at September 30, 2025

  168  $82,920   4.9 
             

Vested and exercisable at September 30, 2025

  141  $98,377   4.4 
             

Vested and expected to vest at September 30, 2025

  168  $82,920   4.9 
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block]
  

Three Months Ended September 30,

  

Nine Months Ended September 30,

 

(in thousands)

 

2025

  

2024

  

2025

  

2024

 
                 

Research and development

 $9  $32  $44  $114 

General and administrative

  8   55   77   321 

Total

 $17  $86  $121  $434