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Note 9 - Fair Value - Fair Values for Investments (Details) - USD ($)	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Realized gains and (losses)	$ 23,984
Total changes in fair values included in current period earnings (loss)	(24,745,513)	$ (76,105)
Reported Value Measurement [Member]
Marketable equity securities, securities available for sale and corporate bonds	60,235,714
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member]
Marketable equity securities, securities available for sale and corporate bonds	$ 60,235,714

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- Definition

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

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- Definition

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

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- Definition

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.

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