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Note 17 - Special Purpose Acquisition Company (Details Textual) - USD ($) |  | 1 Months Ended | 3 Months Ended | 4 Months Ended |
--- | --- | --- | --- | --- | ---
Nov. 16, 2020 | Oct. 31, 2020 | Mar. 31, 2021 | Mar. 31, 2020 | Nov. 30, 2020 | Dec. 31, 2020
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  |  | $ 9.95 |  |  | $ 9.95
Payments to Acquire Investments, Total |  |  | $ 518,225,946 | $ 218,274,275 |  |
Yellowstone Acquisition Company [Member] |  |  |  |  |  |
Equity Method Investment, Ownership Percentage |  |  |  |  | 20.00% |
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, Number of Warrants (in shares) |  | 0.5 |  |  |  |
Sale of Unit, Price Per Unit (in dollars per share) |  | $ 10.00 |  |  |  |
Units Issued During Period, 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] | Lead Investor in Yellowstone’s IPO [Member] |  |  |  |  |  |
Number of Investee's Shares Agreed to Transfer Upon Business Combination (in shares) | 206,250 |  |  |  |  |
BOC Yellowstone LLC [Member] | BOC Yellowstone II LLC [Member] |  |  |  |  |  |
Proceeds from Sale of Equity Method Investments | $ 309,375 |  |  |  |  |
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] | Class B Common Stock of Yellowstone Acquisition Company [Member] | BOC Yellowstone II LLC [Member] |  |  |  |  |  |
Number of Investee's Shares Transferred to Related Party for No Consideration (in shares) | 206,250 |  |  |  |  |
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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