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Note 14 - Segments (Tables)
3 Months Ended
Mar. 31, 2021
Notes Tables  
Schedule of Segment Reporting Information, by Segment [Table Text Block]
   
Three Months Ended March 31,
 
   
2021
   
2020
 
Revenues:
               
Gevo   $
13
    $
125
 
Agri-Energy
   
80
     
3,700
 
Renewable Natural Gas
   
     
 
Net-Zero    
     
 
                 
Consolidated
  $
93
    $
3,825
 
                 
Loss from operations:
               
Gevo
  $
(5,104
)   $
(2,881
)
Agri-Energy
   
(2,047
)    
(4,939
)
Renewable Natural Gas    
(68
)    
(156
)
Net-Zero    
(2,659
)    
 
                 
Consolidated
  $
(9,878
)   $
(7,976
)
                 
Interest expense:
               
Gevo
  $
    $
543
 
Agri-Energy
   
     
2
 
Renewable Natural Gas    
5
     
 
Net-Zero    
     
 
                 
Consolidated
  $
5
    $
545
 
                 
Depreciation and amortization expense:
               
Gevo
  $
56
    $
56
 
Agri-Energy
   
1,093
     
1,593
 
Renewable Natural Gas    
     
 
Net-Zero    
     
 
                 
Consolidated
  $
1,149
    $
1,649
 
                 
Acquisitions of plant, property and equipment:
               
Gevo
  $
253
    $
10
 
Agri-Energy
   
10
     
791
 
Renewable Natural Gas    
5,169
     
 
Net-Zero    
     
 
                 
Consolidated
  $
5,432
    $
801
 
                 
Revenue by geographic area                
United States   $
93
    $
3,750
 
Other    
     
75
 
                 
Consolidated   $
93
    $
3,825
 
   
March 31,
   
December 31,
 
   
2021
   
2020
 
                 
Total assets
               
Gevo
  $
595,834
    $
152,177
 
Agri-Energy
   
129,523
     
131,893
 
Renewable Natural Gas    
12,748
     
Net-Zero    
110
     
 
Intercompany eliminations (1)
   
(129,487
)    
(131,971
)
                 
Consolidated (2)
  $
608,728
    $
152,099