v3.26.1
Note 11 - Stockholders' Equity (Tables)
6 Months Ended
Jun. 30, 2026
Notes Tables  
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block]
  

Three Months Ended June 30,

  

Six Months Ended June 30,

 
  

2026

  

2025

  

2026

  

2025

 

Plant operations

 $1  $5  $2  $13 

Research and development cost

  35   30   67   69 

General and administrative expense

  289   310   706   965 

Total

 $325  $345  $775  $1,047 
Share-based Payment Arrangement, Option and Restricted Stock Unit, Activity [Table Text Block]
  

Number of Shares

  

Number of

  

Number of

 
  

Available for

  

PSUs

  

RSUs

 
  

Grant

  

Outstanding

  

Outstanding

 

Balances, December 31, 2025

  37,749   11,878   235,600 

Granted

  (61,319)     61,319 

Released

        (50,314)

Forfeited

  19,032   (11,878)  (7,154)

Returned to Plan

  17,269       

Balances, June 30, 2026

  12,731      239,451