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Note 8 - Investments, Including Investments Accounted for Using the Equity Method - Schedule of Investments (Details) - USD ($)	Dec. 31, 2022	Dec. 31, 2021
Short-term Investments	$ 6,288,828	$ 4,728,995
Long-term investments	26,136,636	19,316,769
Certificates of Deposit [Member]
Short-term Investments	0	310,276
US Treasury Securities [Member]
Long-term investments	6,729,457	154,265
U.S. Treasury Notes and Corporate Bonds [Member]
Short-term Investments	4,757,224	4,418,719
Preferred Stock [Member]
Long-term investments	348,694	104,019
Common Stock Warrants of Sky Harbour Group Corporation [Member]
Short-term Investments	1,531,604	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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(12))
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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
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
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