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FINANCIAL INSTRUMENTS (Tables) | 6 Months Ended
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Jun. 30, 2021
FINANCIAL INSTRUMENTS |
Schedule of Fair Value on Recurring and Non-recurring Basis | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 30, 2021
(thousands of dollars) |  | Level 1 |  | Level 2 |  | Level 3 |  | Total
Current Assets |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Equity securities | ​ | $ | 2,931 | ​ | $ | — | ​ | $ | — | ​ | $ | 2,931
Total current assets recorded at fair value | ​ | $ | 2,931 | ​ | $ | — | ​ | $ | — | ​ | $ | 2,931
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​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2020
(thousands of dollars) |  | Level 1 |  | Level 2 |  | Level 3 |  | Total
Current Assets |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Equity securities | ​ | $ | — | ​ | $ | — | ​ | $ | 1,520 | ​ | $ | 1,520
Total current assets recorded at fair value | ​ | $ | — | ​ | $ | — | ​ | $ | 1,520 | ​ | $ | 1,520
Non-current Assets | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Restricted cash | ​ | $ | 10 | ​ | $ | — | ​ |  | — | ​ | $ | 10
Total non-current assets recorded at fair value | ​ | $ | 10 | ​ | $ | — | ​ | $ | — | ​ | $ | 10

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- Definition Tabular disclosure of assets measured at fair value measured on a recurring or nonrecurring basis. Includes, but is not limited to, fair value measurements recorded and the reasons for the measurements, level within the fair value hierarchy in which the fair value measurements are categorized and transfers between levels 1 and 2. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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