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Note 12 - Stockholders' Equity (Tables)
6 Months Ended
Jun. 30, 2023
Notes Tables  
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block]
  

Three Months Ended June 30,

  

Six Months Ended June 30,

 
  

2023

  

2022

  

2023

  

2022

 

Plant operations

 $18  $23  $47  $48 

Research and development cost

  22   18   40   36 

General and administrative expense

  559   493   1,199   1,055 

Total

 $599  $534  $1,286  $1,139