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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 | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Jan. 25, 2022 | Sep. 14, 2021 | May 31, 2018 | Oct. 31, 2020 | Jan. 31, 2018 | Mar. 31, 2023 | Mar. 31, 2022 | Nov. 30, 2020 | Dec. 31, 2022 | Dec. 31, 2020
Payments to Acquire Equity Method Investments |  |  |  |  |  | $ (0) | $ 45,000,000 |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  |  |  |  |  | $ 9.95 |  |  | $ 9.95 |
Payments to Acquire Investments, Total |  |  |  |  |  | $ 52,671,304 | 30,496,420 |  |  |
Deconsolidation, Gain (Loss), Amount |  |  |  |  |  | 0 | $ 24,977,740 |  |  |
Deconsolidation, Gain (Loss), Recognized, Amount |  |  |  |  |  | 0 |  |  | $ 10,010,090 |
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 |  |  |  |  |  |  |  |  |
Yellowstone Acquisition Company [Member] |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance Initial Public Offering |  |  |  | $ 125,000,000 |  |  |  |  |  |
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) |  |  |  |  |  |  |  | $ 11.50 |  |
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 |  |
IPO [Member] | Yellowstone Acquisition Company [Member] |  |  |  |  |  |  |  |  |  |
Units Issued During Period, Number (in shares) |  |  |  | 13,598,898 |  |  |  |  |  |
Units Issued During Period, Price Per Unit (in dollars per share) |  |  |  | $ 10.00 |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  |  |  | 11.50 |  |  |  |  |  |
Sale of Unit, Price Per Unit (in dollars per share) |  |  |  | $ 10.00 |  |  |  |  |  |
IPO [Member] | Yellowstone Acquisition Company [Member] | Common Class A [Member] |  |  |  |  |  |  |  |  |  |
Units Issued During Period, Number of Common Stock, Shares (in shares) |  |  |  | 1 |  |  |  |  |  |
IPO [Member] | Yellowstone Acquisition Company Warrants [Member] |  |  |  |  |  |  |  |  |  |
Units Issued During Period, Number of Warrants (in shares) |  |  |  | 0.5 |  |  |  |  |  |
Unconsolidated Affiliates [Member] |  |  |  |  |  |  |  |  |  |
Equity Method Investments |  |  |  |  |  | $ 618,587 |  |  |  |
Unconsolidated Affiliates [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage |  |  |  |  |  | 16.00% |  |  |  |
Unconsolidated Affiliates [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage |  |  |  |  |  | 23.00% |  |  |  |
The 24th Street Fund I, LLC [Member] |  |  |  |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage |  |  |  |  |  |  | 49.90% |  |  |
Payments to Acquire Equity Method Investments |  |  |  |  |  |  |  |  |  | $ 6,000,000
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 |  |  |  |  |  | 22.95% | 22.95% |  |  |
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 |  |  |  |  | 13,118,474 | 13,118,474 |  |  |
Deconsolidation, Gain (Loss), Amount |  |  |  |  |  |  | $ 24,977,740 |  |  |
Deconsolidation, Gain (Loss), Recognized, Amount |  |  |  |  |  |  | 10,000,000 |  |  |
Deconsolidation, Gain (Loss), Assets and Liabilities |  |  |  |  |  |  | $ 15,000,000 |  |  |
Equity Method Investment, Quoted Market Value |  |  |  |  |  | $ 94,300,000 |  |  |  |
Equity Method Investments, Price Per Share (in dollars per share) |  |  |  |  |  | $ 7.73 |  |  |  |
Breezeway Homes Inc. [Member] |  |  |  |  |  |  |  |  |  |
Preferred Stock, Dividend Rate, Per-Dollar-Amount (in dollars per share) |  |  |  |  | $ 2,665 |  |  |  |  |
Preferred Stock [Member] | Breezeway Homes Inc. [Member] |  |  |  |  |  |  |  |  |  |
Debt Conversion, Converted Instrument, Shares Issued (in shares) |  |  |  |  | 31,227 |  |  |  |  |
Voting Common Stock of Privately Held Company CB&T Holding Corporation [Member] |  |  |  |  |  |  |  |  |  |
Payments to Acquire Long-term Investments |  |  | $ 19,058,485 |  |  |  |  |  |  |
Cost Method Investment, Ownership Percentage |  |  | 15.60% |  |  |  |  |  |  |
Equity Investments [Member] |  |  |  |  |  |  |  |  |  |
Other than Temporary Impairment Losses, Investments |  |  |  |  |  | $ 0 |  |  |  |
Class B Common Stock of Yellowstone Acquisition Company [Member] | BOC Yellowstone LLC [Member] |  |  |  |  |  |  |  |  |  |
Payments to Acquire Investments, Total |  |  |  |  |  |  |  | $ 7,800,000 |  |
Investment Owned, Balance, Shares (in shares) |  |  |  |  |  |  |  | 3,399,724 |  |

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