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Note 17 - Special Purpose Acquisition Company (Details Textual) - USD ($) |  |  | 1 Months Ended | 3 Months Ended | 4 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Jan. 25, 2022 | Sep. 14, 2021 | Oct. 31, 2020 | Mar. 31, 2022 | Mar. 31, 2021 | Nov. 30, 2020 | Dec. 31, 2021
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  |  |  | $ 9.95 |  |  | $ 9.95
Payments to Acquire Investments, Total |  |  |  | $ 30,496,420 | $ 518,225,946 |  |
Payments to Acquire Equity Method Investments |  |  |  | 45,000,000 | (0) |  |
Deconsolidation, Gain (Loss), Amount |  |  |  | 24,977,740 | $ 0 |  |
Deconsolidation, Gain (Loss), Recognized, Amount |  |  |  | $ 10,010,090 |  |  | $ 0
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] |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage |  |  |  |  |  | 20.00% |
SHG Corporation [Member] |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage |  |  |  | 22.96% |  |  |
Equity Method Investment, Shares (in shares) | 4,500,000 |  |  |  |  |  |
Equity Method Investment, Price Per Share (in dollars per share) | $ 10 |  |  |  |  |  |
Payments to Acquire Equity Method Investments | $ 45,000,000 | $ 45,000,000 |  |  |  |  |
Deconsolidation, Gain (Loss), Amount |  |  |  | $ 24,977,740 |  |  |
Deconsolidation, Gain (Loss), Recognized, Amount |  |  |  | 10,000,000 |  |  |
Deconsolidation, Gain (Loss), Assets and Liabilities |  |  |  | $ 15,000,000 |  |  |
Yellowstone Acquisition Company [Member] |  |  |  |  |  |  |
Proceeds from Issuance Initial Public Offering |  |  | $ 125,000,000 |  |  |  |
Yellowstone Acquisition Company [Member] | Warrants Issued in Connection with Units [Member] |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  |  | $ 11.50 |  |  |  |
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) |  |  | $ 10.00 |  |  |  |
Units Issued During Period, Number of Warrants (in shares) |  |  | 0.5 |  |  |  |
Sale of Unit, Price Per Unit (in dollars per share) |  |  | $ 10.00 |  |  |  |
Yellowstone Acquisition Company [Member] | IPO [Member] | Common Class A [Member] |  |  |  |  |  |  |
Units Issued During Period, Number of Common Stock, Shares (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 |
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 |

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