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Note 8 - Investments, Including Investments Accounted for Using the Equity Method (Details Textual) - USD ($) |  |  |  |  | 1 Months Ended | 3 Months Ended | 4 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Nov. 02, 2023 | May 01, 2023 | Jan. 25, 2022 | Sep. 14, 2021 | Jul. 31, 2023 | Oct. 31, 2020 | May 31, 2018 | Dec. 31, 2023 | Mar. 31, 2022 | Nov. 30, 2020 | Sep. 30, 2024 | Sep. 30, 2023 | Nov. 29, 2023 | May 31, 2023 | Apr. 25, 2022
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  |  |  |  |  |  |  | $ 9.95 |  |  | $ 9.95 |  |  |  |
Payments to Acquire Equity Method Investments |  |  |  |  |  |  |  |  |  |  | $ 21,000 | $ 3,000,000 |  |  |
Common Stock, Par or Stated Value Per Share (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.001
Common Class A [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Par or Stated Value Per Share (in dollars per share) |  |  |  |  |  |  |  | $ 1 |  |  | $ 1 |  |  |  |
CB&T Holding Corporation [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage |  |  |  |  |  |  | 15.60% |  |  |  |  |  |  |  |
Yellowstone Acquisition Company [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage |  |  |  |  |  |  |  |  |  | 20.00% |  |  |  |  |
Sky Harbour Group Corporation [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to Acquire Equity Method Investments |  |  |  | $ 55,000,000 |  |  |  |  |  |  |  |  |  |  |
Sky Harbour Group Corporation Class A Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage |  |  |  |  |  |  |  |  |  |  | 18.60% |  |  |  |
Payments to Acquire Equity Method Investments |  |  | $ 45,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Equity Method Investment, Shares, Converted from Other Equity (in shares) |  |  | 5,500,000 |  |  |  |  |  |  |  |  |  |  |  |
Equity Method Investment, Price Per Share (in dollars per share) |  |  | $ 10 |  |  |  |  |  |  |  |  |  |  |  |
Equity Method Investment, Shares (in shares) |  |  | 4,500,000 |  |  |  |  |  |  |  | 12,440,642 |  |  |  |
Deconsolidation, Gain (Loss), Amount |  |  |  |  |  |  |  |  | $ 24,977,740 |  |  |  |  |  |
Deconsolidation, Gain (Loss), Recognized, Amount |  |  |  |  |  |  |  |  | 10,000,000 |  |  |  |  |  |
Deconsolidation, Gain (Loss), Assets and Liabilities |  |  |  |  |  |  |  |  | $ 15,000,000 |  |  |  |  |  |
Undistributed Earnings (Loss) Allocated to Participating Securities, Basic |  |  |  |  |  |  |  | $ 2,200,000 |  |  |  |  |  |  |
Equity Method Investments |  |  |  |  |  |  |  |  |  |  | $ 72,900,000 |  |  |  |
Equity Method Investment, Quoted Market Value |  |  |  |  |  |  |  |  |  |  | $ 137,300,000 |  |  |  |
Yellowstone Acquisition Company [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance Initial Public Offering |  |  |  |  |  | $ 125,000,000 |  |  |  |  |  |  |  |  |
Yellowstone Acquisition Company [Member] | IPO [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Units Issued During Period, Number (in shares) |  |  |  |  |  | 13,598,898 |  |  |  |  |  |  |  |  |
Units Issued During Period, Price Per Unit (in dollars per share) |  |  |  |  |  | $ 10 |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  |  |  |  |  | 11.5 |  |  |  |  |  |  |  |  |
Sale of Unit, Price Per Unit (in dollars per share) |  |  |  |  |  | $ 10 |  |  |  |  |  |  |  |  |
Yellowstone Acquisition Company [Member] | IPO [Member] | Common Class A [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Units Issued During Period, Number of Common Stock, Shares (in shares) |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  |
Yellowstone Acquisition Company Warrants [Member] | IPO [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Units Issued During Period, Number of Warrants (in shares) |  |  |  |  |  | 0.5 |  |  |  |  |  |  |  |  |
BOC Yellowstone LLC [Member] | Non-redeemable Private Placement Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  |  |  |  |  |  |  |  |  | $ 11.5 |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  |  |  |  |  |  |  |  |  | 7,719,779 |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares) |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |
BOC Yellowstone LLC [Member] | Class B Common Stock of Yellowstone Acquisition Company [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to Acquire Investments, Total |  |  |  |  |  |  |  |  |  | $ 7,800,000 |  |  |  |  |
Investment Owned, Balance, Shares (in shares) |  |  |  |  |  |  |  |  |  | 3,399,724 |  |  |  |  |
Sky Harbour Group Corporation [Member] | Private Placement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | 1,141,600 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) | 6,586,154 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ 0.0001 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance or Sale of Equity | $ 42,810,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sky Harbour Group Corporation [Member] | Additional PIPE Offering [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 400,000 |  |
Common Stock, Par or Stated Value Per Share (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.0001 |  |
Proceeds from Issuance or Sale of Equity | $ 57,810,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity Offering, Maximum Shares (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 2,307,692 |  |
Equity Offering, Maximum Amount |  |  |  |  |  |  |  |  |  |  |  |  | $ 15,000,000 |  |
The 24th Street Asset Management, LLC [Member] | Boston Omaha Asset Management, LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition, Percentage of Voting Interests Acquired |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Consideration Transferred |  | $ 5,016,494 |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Step Acquisition, Equity Interest in Acquiree, Percentage |  |  |  |  |  |  |  |  |  |  |  |  |  | 48.00% |
Payments to Acquire Businesses, Gross |  | $ 2,759,072 |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares (in shares) |  | 45,644 |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Step Acquisition, Equity Interest in Acquiree, Remeasurement Gain |  | $ 4,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |
The 24th Street Asset Management, LLC [Member] | Boston Omaha Asset Management, LLC [Member] | Holdback Cash Consideration [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to Acquire Businesses, Gross |  | $ 1,254,102 |  |  |  |  |  |  |  |  |  |  |  |  |
CB&T Holding Corporation [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to Acquire Businesses, Gross |  |  |  |  |  |  | $ 19,058,485 |  |  |  |  |  |  |  |
My Bundle TV Inc. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to Acquire Businesses, Gross |  |  |  |  | $ 3,000,000 |  |  |  |  |  |  |  |  |  |
Business Combination Agreement with SHG [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to Acquire Businesses, Gross |  |  |  | 55,000,000 |  |  |  |  |  |  |  |  |  |  |
Business Acquisition, Backstop Agreed to Be Provided to Acquiree, Maximum Value |  |  |  | $ 45,000,000 |  |  |  |  |  |  |  |  |  |  |
Business Acquisition, Backstop Agreed to Be Provided to Acquiree, Price Per Share (in dollars per share) |  |  |  | $ 10 |  |  |  |  |  |  |  |  |  |  |

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- Definition the maximum shares to be issued in equity offering. + References No definition available. + Details
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- Definition Exercise price per share or per unit of warrants or rights outstanding. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 505 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481112/505-10-50-3 + Details
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- Definition Number of securities into which each warrant or right may be converted. For example, but not limited to, each warrant may be converted into two shares. + References No definition available. + Details
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- Definition Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 505 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481112/505-10-50-3 + Details
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- Definition Face amount or stated value per share of common stock. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 + Details
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- Definition Amount of gain (loss) from deconsolidation of subsidiary and derecognition of group of assets constituting transfer of business or nonprofit activity, excluding conveyance of oil and gas mineral rights and transfer of good or service in contract with customer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1B -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481203/810-10-50-1B + Details
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- Definition This item represents the aggregate value of each identified investment accounted for under the equity method of accounting based on the quoted market price for those investments in common stock for which a quoted market price is available. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 323 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481687/323-10-50-3 + Details
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- Definition This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 270 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482964/270-10-50-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 32 -Subparagraph (ee) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-32 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 323 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481664/323-10-45-1 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 323 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481687/323-10-50-3 Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(10)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 25 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-25 + Details
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