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Note 9 - Fair Value (Details Textual)	3 Months Ended
	Mar. 31, 2024 USD ($) shares	Mar. 31, 2023 USD ($)	Dec. 31, 2023 USD ($)	Nov. 02, 2023	Nov. 01, 2023	Mar. 31, 2022 shares	Jan. 25, 2022 shares
Long-Term Debt	$ 27,135,708
Boston Omaha [Member]
Equity Securities, FV-NI, Total	84,000,000
The 24th Street Funds, Special Purpose Entities [Member]
Investment Owned, Fair Value	$ 63,000,000		$ 65,000,000
The 24th Street Funds, Special Purpose Entities [Member] | Measurement Input, Cap Rate [Member] | Minimum [Member]
Investment Company, Investment Owned, Measurement Input	0.065
The 24th Street Funds, Special Purpose Entities [Member] | Measurement Input, Cap Rate [Member] | Maximum [Member]
Investment Company, Investment Owned, Measurement Input	0.0675
Sky Harbour Group Corporation Class A Common Stock [Member]
Equity Method Investment, Ownership Percentage	19.80%			19.80%	22.90%
Equity Method Investment, Shares (in shares) | shares	13,118,474					13,118,474	4,500,000
Equity Method Investment, Quoted Market Value	$ 167,500,000
Private Placement Warrants [Member]
Fair Value Adjustment of Warrants	8,000,000	$ 2,300,000
Fair Value, Inputs, Level 2 [Member]
Long-Term Debt, Fair Value	$ 24,743,380

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