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FAIR VALUE OF FINANCIAL INSTRUMENTS - UNL's Securities Fair Value Hierarchy (Details) - USD ($) | Sep. 30, 2021 | Dec. 31, 2020
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United States [Member] |  |
FAIR VALUE OF FINANCIAL INSTRUMENTS |  |
Securities, fair value | $ 5,232,232 | $ (21,964)
Short-Term Investments [Member] |  |
FAIR VALUE OF FINANCIAL INSTRUMENTS |  |
Securities, fair value | 7,000,000 | 1,000,000
Fair Value, Inputs, Level 1 [Member] | United States [Member] |  |
FAIR VALUE OF FINANCIAL INSTRUMENTS |  |
Securities, fair value | 5,232,232 | (21,964)
Fair Value, Inputs, Level 1 [Member] | Short-Term Investments [Member] |  |
FAIR VALUE OF FINANCIAL INSTRUMENTS |  |
Securities, fair value | 7,000,000 | 1,000,000
Fair Value, Inputs, Level 2 [Member] | United States [Member] |  |
FAIR VALUE OF FINANCIAL INSTRUMENTS |  |
Securities, fair value | 0 | 0
Fair Value, Inputs, Level 2 [Member] | Short-Term Investments [Member] |  |
FAIR VALUE OF FINANCIAL INSTRUMENTS |  |
Securities, fair value | 0 | 0
Fair Value, Inputs, Level 3 [Member] | United States [Member] |  |
FAIR VALUE OF FINANCIAL INSTRUMENTS |  |
Securities, fair value | 0 | 0
Fair Value, Inputs, Level 3 [Member] | Short-Term Investments [Member] |  |
FAIR VALUE OF FINANCIAL INSTRUMENTS |  |
Securities, fair value | $ 0 | $ 0

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- Definition Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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