XML 45 R30.htm IDEA: XBRL DOCUMENT
v3.21.2

FAIR VALUE OF FINANCIAL INSTRUMENTS - Valuation of Securities Using Fair Value Hierarchy (Details) - USD ($) | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
United States |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Investments, Fair Value Disclosure | $ 33,764,400 | $ 36,882,450
Short-Term Investments |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Investments, Fair Value Disclosure | 95,796,000 | 20,196,000
Fair Value, Inputs, Level 1 | United States |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Investments, Fair Value Disclosure | 33,764,400 | 36,882,450
Fair Value, Inputs, Level 1 | Short-Term Investments |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Investments, Fair Value Disclosure | $ 95,796,000 | $ 20,196,000

X
- 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
Name: | us-gaap_InvestmentsFairValueDisclosure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- 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
Name: | us-gaap_ScheduleOfTradingSecuritiesAndOtherTradingAssetsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | srt_StatementGeographicalAxis=country_US
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=us-gaap_ShortTermInvestmentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |