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Note 9 - Fair Value (Details Textual) - USD ($)	1 Months Ended	3 Months Ended		8 Months Ended	9 Months Ended
	Jan. 25, 2022	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2022	Sep. 30, 2021	Mar. 31, 2022
Long-Term Debt, Total		$ 28,876,720		$ 28,876,720	$ 28,876,720
Fair Value Adjustment of Warrants	$ (1,837,211)	$ (0)	$ 1,019,917		$ (1,837,211)	$ (2,039,835)
Sky Harbour Group Corporation Class A Common Stock [Member]
Equity Method Investment, Ownership Percentage		22.96%		22.96%	22.96%		22.96%
Equity Method Investment, Shares (in shares)	4,500,000	13,118,474		13,118,474	13,118,474		13,118,474
Equity Method Investment, Quoted Market Value		$ 48,300,000		$ 48,300,000	$ 48,300,000
Boston Omaha [Member]
Equity Securities, FV-NI, Total		80,000,000		80,000,000	80,000,000
Equity Securities, FV-NI, Realized Gain (Loss), Total					34,000,000	$ 34,000,000
Private Placement Warrants [Member]
Fair Value Adjustment of Warrants				1,408,860
Fair Value, Inputs, Level 2 [Member]
Long-Term Debt, Fair Value		$ 26,529,705		$ 26,529,705	$ 26,529,705

X

- Definition

The number of shares.

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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Amount of realized gain (loss) from sale of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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Amount of expense (income) related to adjustment to fair value of warrant liability.

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Amount, excluding unamortized premium (discount) and debt issuance cost, of long-term debt. Excludes lease obligation.

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