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Note 3 - Property, Plant and Equipment
9 Months Ended
Sep. 30, 2018
Notes to Financial Statements  
Property, Plant and Equipment Disclosure [Text Block]
NOTE 
3
—PROPERTY, PLANT AND EQUIPMENT
 
 
The Company’s property, plant and equipment consist of the following:
 
   
September 30,
2018
   
December 31,
2017
 
                 
Plant and equipment at cost
  $
104,389,458
    $
80,454,977
 
Construction in process
   
15,150,635
     
7,625,855
 
Capitalized mine development cost
   
37,068,316
     
30,775,765
 
Less: Accumulated depreciation and amortization
   
(12,138,180
)    
(3,405,756
)
Total property, plant and equipment, net
  $
144,470,229
    $
115,450,841
 
 
During the
three
months ended
September 30, 2018,
depreciation expense related to our plant and equipment totaled
$2.6
million and amortization of our capitalized development costs totaled
$0.8
million. During the
three
months ended
September 30, 2017,
depreciation expense related to our plant and equipment totaled
$0.8
million and amortization of our capitalized development costs totaled
$0.1
million.
 
During the
nine
months ended
September 30, 2018,
depreciation expense related to our plant and equipment totaled
$6.9
million and amortization of our capitalized development costs totaled
$1.8
million. During the
nine
months ended
September 30, 2017,
depreciation expense related to our plant and equipment totaled
$1.1
million and amortization of our capitalized development costs totaled
$0.2
million.
 
Capitalized amounts related to coal reserves at properties where we are 
not
 currently engaged in mining operations totaled 
$5.5
 million as of 
September 30, 2018 
and 
$8.7
 million as of 
December 
31,
 
2017.