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Note 13 - Earnings (Loss) Per Share (Tables)
 12 Months Ended
Dec. 31, 2017
Notes Tables  
Pro Forma Information [Table Text Block]
Net loss
   $
(15,416,549
 )
Add: Interest expense on note payable to Ramaco Coal, LLC
(1)
    
21,855
  
Basic net loss attributable to common shareholders
    
(15,394,694
 )
Effect of dilutive securities
(2)
    
—
  
Diluted net loss attributable to common shareholders
   $
(15,394,694
 )
         
Weighted average shares outstanding (basic and fully diluted)
    
37,578,318
  
Pro forma basic and diluted loss per share
(3)
   $
(0.41
 )