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Note 5 - Inventories (Tables)
3 Months Ended
Mar. 31, 2020
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
   
March 31,
   
December 31,
 
   
2020
   
2019
 
Raw materials
               
Corn
  $
14
    $
267
 
Enzymes and other inputs
   
155
     
184
 
Finished goods
               
Jet Fuels, Isooctane and Isooctene    
795
     
571
 
Isobutanol    
44
     
135
 
Ethanol
   
     
93
 
Distiller's grains
   
8
     
54
 
Work in process
               
Agri-Energy
   
     
254
 
Gevo
   
142
     
122
 
Spare parts
   
1,522
     
1,521
 
                 
Total inventories
  $
2,680
    $
3,201