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Note 9 - Fair Value (Details Textual) - USD ($)	1 Months Ended	11 Months Ended	12 Months Ended
	Jan. 25, 2022	Dec. 31, 2022	Dec. 31, 2022	Dec. 31, 2021	Mar. 31, 2022
Long-Term Debt, Total		$ 28,499,270	$ 28,499,270
Fair Value Adjustment of Warrants	$ (1,837,211)		(1,837,211)	$ (2,854,407)
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability			$ (900,000)	0
Sky Harbour Group Corporation Class A Common Stock [Member]
Equity Method Investment, Ownership Percentage		22.96%	22.96%		22.96%
Equity Method Investment, Shares (in shares)	4,500,000	13,118,474	13,118,474		13,118,474
Equity Method Investment, Quoted Market Value		$ 34,900,000	$ 34,900,000
Boston Omaha [Member]
Equity Securities, FV-NI, Total		84,000,000	84,000,000
Equity Securities, FV-NI, Realized Gain (Loss), Total			38,200,000	$ 40,400,000
Private Placement Warrants [Member]
Fair Value Adjustment of Warrants		2,714,274
Fair Value, Inputs, Level 2 [Member]
Long-Term Debt, Fair Value		$ 26,258,113	$ 26,258,113

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The number of shares.

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Amount of increase (decrease) in the value of a contingent consideration liability, including, but not limited to, differences arising upon settlement.

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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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