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Note 8 - Investments, Including Investments Accounted for Using the Equity Method - Schedule of Investments (Details) - USD ($)	Sep. 30, 2022	Dec. 31, 2021
Short-term Investments	$ 7,907,196	$ 4,728,995
Long-term investments	21,379,786	19,316,769
Certificates of Deposit [Member]
Short-term Investments	310,975	310,276
US Treasury Securities [Member]
Long-term investments	1,972,606	154,265
U.S. Treasury Notes and Corporate Bonds [Member]
Short-term Investments	4,759,202	4,418,719
Preferred Stock [Member]
Long-term investments	348,695	104,019
Common Stock Warrants of Sky Harbour Group Corporation [Member]
Short-term Investments	2,837,019	0
Voting Common Stock of Privately Held Company CB&T Holding Corporation [Member]
Long-term investments	$ 19,058,485	$ 19,058,485

X

- Definition

The total amount of investments that are intended to be held for an extended period of time (longer than one operating cycle).

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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- Definition

Amount of investments including trading securities, available-for-sale securities, held-to-maturity securities, and short-term investments classified as other and current.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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-Publisher FASB
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