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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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- Definition Amount of increase (decrease) in the value of a contingent consideration liability, including, but not limited to, differences arising upon settlement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 4 -Subparagraph (a)(1) -URI https://asc.fasb.org/extlink&oid=126975305&loc=d3e7008-128479 + Details
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- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI https://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571 + Details
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