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Note 9 - Fair Value - Fair Values for Investments (Details)	3 Months Ended
	Mar. 31, 2021 USD ($)
Realized gains and (losses)	$ 2,864,074
Total changes in fair values included in current period earnings (loss)	104,467,952
Reported Value Measurement [Member]
Marketable equity securities and U.S. Treasury trading securities	198,489,999
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member]
Marketable equity securities and U.S. Treasury trading securities	$ 204,123,702

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

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Cost of investment in debt investment in debt security measured at fair value with change in fair value recognized in net income (trading) and investment in equity security with change in fair value recognized in net income (FV-NI). Excludes equity method investment and investment in equity security without readily determinable fair value.

+ References

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