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Note 10 - Gevo Development (Tables)
6 Months Ended
Jun. 30, 2018
Notes Tables  
Schedule of Investments in and Advances to Affiliates, Schedule of Investments [Table Text Block]
   
Three Months Ended June 30, 2018
   
Six Months Ended June 30, 2018
 
   
2018
   
2017
   
2018
   
2017
 
Gevo Development Net Loss
  $
(2,062
)   $
(3,067
)   $
(4,579
)   $
(7,178
)