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Note 8 - Investments, Including Investments Accounted for Using the Equity Method - Schedule of Investments (Details) - USD ($)	Sep. 30, 2023	Dec. 31, 2022
Short-term Investments	$ 8,600,527	$ 6,288,828
Short-term Investments	8,600,527	6,288,828
Long-term investments	67,852,244	26,136,636
U.S. Treasury Notes and Corporate Bonds [Member]
Short-term Investments	5,448,471	4,757,224
Short-term Investments	5,448,471	4,757,224
US Treasury Securities [Member]
Long-term investments	4,749,166	6,729,457
Notes Receivable [Member]
Short-term Investments	1,608,100	0
Short-term Investments	1,608,100	0
Special Purpose Entities [Member]
Long-term investments	43,695,899	0
Common Stock Warrants of Sky Harbour Group Corporation [Member]
Short-term Investments	1,543,956	1,531,604
Short-term Investments	1,543,956	1,531,604
Preferred Stock [Member]
Long-term investments	348,694	348,694
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
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(12))
-Publisher FASB
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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://www.xbrl.org/2009/role/commonPracticeRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(8))
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