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Note 16 - Segments (Tables)
 12 Months Ended
Dec. 31, 2019
Notes Tables  
Schedule of Segment Reporting Information, by Segment [Table Text Block]
   
Year Ended December 31,
   
201
9
    
201
8
  
   
(In thousands)
Revenues from external customers
                
Gevo
   $
2,338
     $
1,222
  
Gevo Development / Agri-Energy
    
22,149
      
31,641
  
                 
Consolidated
   $
24,487
     $
32,863
  
                 
Loss from operations
                
Gevo
   $
(12,360
 )   $
(11,552
)
Gevo Development / Agri-Energy
    
(13,991
 )    
(10,649
)
                 
Consolidated
   $
(26,351
 )   $
(22,201
)
                 
Interest expense
                
Gevo
   $
2,732
     $
3,237
  
Gevo Development / Agri-Energy
    
—
      
—
  
                 
Consolidated
   $
2,732
     $
3,237
  
                 
Depreciation and amortization expense
                
Gevo
   $
210
     $
269
  
Gevo Development / Agri-Energy
    
6,446
      
6,251
  
                 
Consolidated
   $
6,656
     $
6,520
  
                 
Acquisitions of plant, property and equipment
                
Gevo
   $
130
     $
27
  
Gevo Development / Agri-Energy
    
6,367
      
3,096
  
                 
Consolidated
   $
6,497
     $
3,123
  
                 
Revenue by geographic area                
United States   $
22,149
     $
31,641
  
Other    
2,338
      
1,222
  
                 
Consolidated   $
24,487
     $
32,863
  
   
December 31,
  
   
201
9
    
201
8
  
Total assets
                
Gevo
   $
91,861
     $
105,379
  
Gevo Development / Agri-Energy
    
143,349
      
140,982
  
Intercompany eliminations (1)
    
(141,851
 )    
(139,326
)
                 
Consolidated (2)
   $
93,359
     $
107,035