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Notes Receivable (Tables) | 3 Months Ended | 12 Months Ended
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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 |
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(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 |
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(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 |
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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 |
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Subtotal Notes Receivable—non-current |  | $ | 2,000 |  | $ | — |  | $ | (507 | ) | $ | 1,493 |
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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 |

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- Definition Tabular disclosure of the various types of trade accounts and notes receivable and for each the gross carrying value, allowance, and net carrying value as of the balance sheet date. Presentation is categorized by current, noncurrent and unclassified receivables. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3,4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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