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Note 9 - Gevo Development (Tables)
3 Months Ended
Mar. 31, 2018
Notes Tables  
Schedule of Investments in and Advances to Affiliates, Schedule of Investments [Table Text Block]
   
Three
Months Ended March 31,
 
   
2018
   
2017
 
Gevo Development Net Loss
  $
(2,517
)   $
(4,173
)