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Note 7 - Investments, Including Investments Accounted for Using the Equity Method (Details Textual) - USD ($) |  |  |  |  |  |  | 1 Months Ended | 2 Months Ended | 3 Months Ended | 4 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 20, 2024 | Oct. 25, 2024 | Nov. 02, 2023 | May 01, 2023 | Jan. 25, 2022 | Sep. 14, 2021 | Jul. 31, 2023 | Oct. 31, 2020 | May 31, 2018 | Dec. 20, 2024 | Mar. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023 | Nov. 30, 2020 | Sep. 30, 2025 | Sep. 30, 2024 | 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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (0) | $ 21,000 |  |  |
Common Stock, Par or Stated Value Per Share (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.001
Stock Issued During Period, Value, New Issues |  |  |  |  |  |  |  |  |  |  | $ 525,256 |  |  |  |  |  |  |  |
Common Class A [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Par or Stated Value Per Share (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  | $ 0.001 |  |  | $ 0.001 |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |
Undistributed Earnings (Loss) Allocated to Participating Securities, Basic |  |  |  |  |  |  |  |  |  |  |  | $ 5,100,000 |  |  |  |  |  |  |
Sky Harbour Group Corporation Class A Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage |  |  |  |  |  |  |  |  |  |  |  | 16.40% |  |  | 15.40% |  |  |  |
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 |  |  |  |  |  |  | 12,401,589 |  |  | 11,671,494 |  |  |  |
Undistributed Earnings (Loss) Allocated to Participating Securities, Basic |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,200,000 |  |  |  |  |  |
Equity Method Investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 71,000,000 |  |  |  |
Equity Method Investment, Quoted Market Value |  |  |  |  |  |  |  |  |  |  |  | $ 148,000,000 |  |  | $ 115,000,000 |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |
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) | 3,955,790 | 3,955,790 | 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 |  |  |  |  |  |  | $ 75,200,000 |  |  |  |  |  |  |  |  |
Stock Issued During Period, Value, New Issues | $ 37,600,000 | $ 37,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares Issued, Price Per Share (in dollars per share) | $ 9.5 |  |  |  |  |  |  |  |  | $ 9.5 |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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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