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Note 9 - Fair Value (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Jan. 25, 2022
Long-Term Debt	$ 26,500,000
Boston Omaha [Member]
Equity Securities, FV-NI	84,000,000
The 24th Street Funds, Special Purpose Entities [Member]
Investment Owned, Fair Value	$ 46,900,000	$ 64,900,000
The 24th Street Funds, Special Purpose Entities [Member] | Measurement Input, Cap Rate [Member] | Minimum [Member]
Investment Company, Investment Owned, Measurement Input	6.25
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	16.40%
Equity Method Investment, Shares (in shares)	12,401,589		4,500,000
Equity Method Investment, Quoted Market Value	$ 148,000,000
Private Placement Warrants [Member]
Fair Value Adjustment of Warrants	17,000,000	$ 4,000,000
Fair Value, Inputs, Level 2 [Member]
Long-Term Debt, Fair Value	$ 24,500,000

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