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Note 9 - Fair Value - Fair Values for Investments (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Marketable equity securities, Cost	$ 49,554,926
Marketable equity securities, realized gain (loss)	550,130
Marketable equity securities, gain (loss)	6,353,001
Securities available for sale, realized gain (loss)	14,902
Securities available for sale, gain (loss)	(79,664)
Realized gain (loss)	565,032
Gain (loss)	6,273,337	$ (15,395)
Reported Value Measurement [Member]
Marketable equity securities, Cost	55,907,927
U.S. Treasury notes, Fair Value	75,409,199
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member]
Marketable equity securities, Cost	55,907,927
U.S. Treasury notes, Fair Value	$ 75,409,199

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- Definition

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

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
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