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Note 9 - Fair Value - Fair Values for Investments (Details)	12 Months Ended
	Dec. 31, 2020 USD ($)
Realized gains and (losses)	$ 5,688,750
Marketable equity securities, U.S. Treasury trading securities, and corporate bonds	(10,402,013)
Reported Value Measurement [Member]
Marketable equity securities, securities available for sale and corporate bonds	102,824,427
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member]
Marketable equity securities, securities available for sale and corporate bonds	$ 102,824,427

X

- Definition

Amount of unrealized and realized gain (loss) on investment in debt and equity securities.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(9)(a))
-URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(7)(c))
-URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227

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- Definition

Amount of realized gain (loss) on investment in debt and equity securities.

+ References

No definition available.

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- Definition

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+ References

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