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Note 8 - Investments, Including Investments Accounted for Using the Equity Method - Schedule of Investments (Details) - USD ($)	Jun. 30, 2023	Dec. 31, 2022
Short-term Investments	$ 11,626,107	$ 6,288,828
Short-term Investments	11,626,107	6,288,828
U.S. Treasury Notes and Corporate Bonds [Member]
Short-term Investments	7,624,876	4,757,224
Short-term Investments	7,624,876	4,757,224
Notes Receivable [Member]
Short-term Investments	1,608,100	0
Short-term Investments	1,608,100	0
Common Stock Warrants of Sky Harbour Group Corporation [Member]
Short-term Investments	2,393,131	1,531,604
Short-term Investments	$ 2,393,131	$ 1,531,604

X

- 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://www.xbrl.org/2009/role/commonPracticeRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(8))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(5))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(4))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1

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