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Short-term Investments - Narrative (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2021 USD ($) position	Jun. 30, 2020 USD ($)	Jun. 30, 2021 USD ($) position	Jun. 30, 2020 USD ($)
Investments, Debt and Equity Securities [Abstract]
Realized gain on investments	$ 358,000	$ 585,000	$ 358,000	$ 635,000
Realized loss on investments	194,000	686,000	204,000	1,200,000
Unrealized gain (loss) on available-for-sale equity securities	$ 136,493	$ 4,358,634	$ (711,465)	$ (691,458)
Number of securities in a gross unrealized loss position | position	22		22
Number of securities in a gross unrealized loss position for more than twelve months | position	4		4
Unrealized loss			$ 211,000

X

- Definition

Number of investments in debt securities measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for 12 months or longer, without an allowance for credit loss. Includes beneficial interest in securitized financial asset.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 30
-Section 50
-Paragraph 4
-Subparagraph (b)(3)
-URI http://asc.fasb.org/extlink&oid=124269663&loc=SL82922888-210455

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Amount of realized gain on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 9
-Subparagraph (a)
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+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
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-Section 50
-Paragraph 9
-Subparagraph (a)
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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 6
-Subparagraph (b)(3)
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Amount of unrealized gain (loss) on investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 220
-Section S99
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Amount of unrealized gain (loss) on investment.

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