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Notes Receivable (Tables)
 3 Months Ended 12 Months Ended
Mar. 31, 2019
Dec. 31, 2018
NOTES RECEIVABLE    
Schedule of Notes Receivable

        The following tables show the notes receivable, accrued interest and unamortized discount on the Company's notes receivable as of March 31, 2019 and December 31, 2018.

 
   March 31, 2019  
(thousands of dollars)
  Note
Amount		   Plus Accrued
Interest		   Less
Unamortized
Note
Discount		   Note Balance
per Balance
Sheet		  

Current Assets

                          

Notes receivable Laramide—current

   $ 2,000   $ —   $ (383 ) $ 1,617  
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Total Notes Receivable—current and non-current

   $ 2,000   $ —   $ (383 ) $ 1,617  
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   December 31, 2018  
(thousands of dollars)
  Note
Amount		   Plus Accrued
Interest		   Less
Unamortized
Note
Discount		   Note Balance
per Balance
Sheet		  

Current Assets

                          

Notes receivable Laramide—current

   $ 1,500   $ 45   $ —   $ 1,545  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Subtotal Notes Receivable—current

   $ 1,500   $ 45   $ —   $ 1,545  
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Non-current Assets

                          

Notes receivable—Laramide—non-current

   $ 2,000   $ —   $ (507 ) $ 1,493  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Subtotal Notes Receivable—non-current

   $ 2,000   $ —   $ (507 ) $ 1,493  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total Notes Receivable—current and non-current

   $ 3,500   $ 45   $ (507 ) $ 3,038  
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The following tables show the notes receivable, accrued interest and unamortized discount on the Company’s notes receivable as of December 31, 2018 and December 31, 2017. 

 

   December 31, 2018 
(thousands of dollars)  Note
Amount		   Plus Accrued
Interest		   Less
Unamortized
Note
Discount		   Note Balance
per Balance
Sheet		 
Current Assets                    
Notes receivable Laramide – current  $1,500   $45   $-   $1,545 
Subtotal Notes Receivable – current  $1,500   $45   $-   $1,545 
                     
Non-current Assets                    
Notes receivable – Laramide – non-current  $2,000   $-   $(507)  $1,493 
Total Notes Receivable – current and non-current  $3,500   $45   $(507)  $3,038 

 

   December 31, 2017 
(thousands of dollars)  Note
Amount		   Plus Accrued
Interest		   Less
Unamortized
Note
Discount		   Note Balance
per Balance
Sheet		 
Current Assets                    
Notes receivable Laramide – current  $1,500   $250   $-   $1,750 
Subtotal Notes Receivable – current  $1,500   $250   $-   $1,750 
                     
Non-current Assets                    
Notes receivable – Laramide – non-current  $3,500   $-   $(1,005)  $2,495 
Notes receivable – Alabama Graphite Corp.   832    1    -    833 
Subtotal Notes Receivable – non-current  $4,332   $1   $(1,005)  $3,328 
Total Notes Receivable – current and non-current  $5,832   $251   $(1,005)  $5,078