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Note 3 - Miscellaneous Financial Information (Tables)
12 Months Ended
Dec. 31, 2021
Notes Tables  
Schedule of Revenue by Major Customers by Reporting Segments [Table Text Block]
   

Year Ended December 31,

 
 Segment (Note 21) 

2021

  

2020

  

2019

 
              
Customer A

Gevo

  53

%

  21

%

  

%

Customer B

Agri-Energy

  24

%

  

%

  

%

Customer C

Gevo

  10

%

  

%

  

%

Customer D

Agri-Energy

  

%

  52

%

  71

%

Customer E

Agri-Energy

  

%

  15

%

  17

%

              

Total

  87

%

  88

%

  88

%

             
Schedule of Restructuring Reserve by Type of Cost [Table Text Block]
  

December 31,

          

December 31,

 
  

2019

  

Additions

  

Payments

  

2020

 
                 

Severance (including payroll taxes)

 $  $96  $(96

)

 $ 

Lease agreements

     158   (158

)

   
                 

Total

 $  $254  $(254

)

 $