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Note 18 - Special Purpose Acquisition Company (As Restated) (Details Textual) |  |  |  |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 01, 2020 $ / shares shares | Nov. 16, 2020 USD ($) shares | Oct. 26, 2020 USD ($) $ / shares shares | Aug. 31, 2020 USD ($) $ / shares shares | Dec. 31, 2020 USD ($) $ / shares shares | Dec. 31, 2020 USD ($) $ / shares shares | Dec. 31, 2019 USD ($) $ / shares shares | Dec. 31, 2018 $ / shares
Stock Issued During Period, Value, New Issues | $ |  |  |  |  |  | $ 59,549,751 | $ 32,204,732 |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares |  |  |  |  | $ 9.95 | $ 9.95 | $ 9.95 | $ 9.95
Assets Held-in-trust, Current | $ |  |  |  |  | $ 138,716,226 | $ 138,716,226 | $ 0 |
Common Class B [Member] |  |  |  |  |  |  |  |
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares |  |  |  |  | $ 0.001 | $ 0.001 | $ 0.001 |
Common Stock, Shares, Outstanding, Ending Balance (in shares) |  |  |  |  | 1,055,560 | 1,055,560 | 1,055,560 |
Common Class A [Member] |  |  |  |  |  |  |  |
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares |  |  |  |  | $ 0.001 | $ 0.001 | $ 0.001 |
Common Stock, Shares, Outstanding, Ending Balance (in shares) |  |  |  |  | 26,175,555 | 26,175,555 | 22,455,100 |
Yellowstone Acquisition Company [Member] |  |  |  |  |  |  |  |
Proceeds from Issuance Initial Public Offering | $ |  |  | $ 125,000,000 |  |  |  |  |
Yellowstone Acquisition Company [Member] | Private Placement Warrants [Member] |  |  |  |  |  |  |  |
Number of Warrants Called by Each Unit (in shares) |  |  | 0.5 |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares) |  |  | 1 |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares |  |  | $ 11.50 |  |  |  |  |
Yellowstone Acquisition Company [Member] | IPO [Member] |  |  |  |  |  |  |  |
Number of Units Issued (in shares) |  |  | 12,500,000 |  |  |  |  |
Sale of Unit, Price Per Unit (in dollars per share) | $ / shares |  |  | $ 10.00 |  |  |  |  |
Yellowstone Acquisition Company [Member] | Over-Allotment Option [Member] |  |  |  |  |  |  |  |
Units Issued During Period, Number (in shares) | 1,098,898 |  |  |  |  |  |  |
Yellowstone Acquisition Company [Member] | BOC Yellowstone LLC [Member] | Private Placement Warrants [Member] |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares | $ 11.50 |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | 219,779 |  | 7,500,000 |  |  |  |  |
Price of Warrant (in dollars per share) | $ / shares | $ 1.00 |  | $ 1.00 |  |  |  |  |
Proceeds from Issuance of Warrants | $ |  |  | $ 7,500,000 |  |  |  |  |
Yellowstone Acquisition Company [Member] | Common Class B [Member] | BOC Yellowstone LLC [Member] |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) |  |  |  | 5,750,000 |  |  |  |
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares |  |  |  | $ 0.0001 |  |  |  |
Stock Issued During Period, Value, New Issues | $ |  |  |  | $ 25,000 |  |  |  |
Common stock, Shares Surrendered (in shares) |  |  |  |  | 2,350,276 |  |  |
Common Stock, Shares, Outstanding, Ending Balance (in shares) |  |  |  |  | 3,399,724 | 3,399,724 |  |
Common Stock, Conversion Rate |  |  |  |  | 1 | 1 |  |
Yellowstone Acquisition Company [Member] | Common Class A [Member] | IPO [Member] |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) |  |  | 13,598,898 |  |  |  |  |
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares |  |  | $ 0.0001 |  |  |  |  |
Number of Securities Called by Each Unit (in shares) |  |  | 1 |  |  |  |  |
BOC Yellowstone LLC [Member] | BOC Yellowstone II LLC [Member] |  |  |  |  |  |  |  |
Proceeds from Sale of Equity Method Investments | $ |  | $ 309,375 |  |  |  |  |  |
BOC Yellowstone LLC [Member] | BOC Yellowstone II LLC [Member] | Class B Common Stock of Yellowstone Acquisition Company [Member] |  |  |  |  |  |  |  |
Number of Investee's Shares Transferred to Related Party for No Consideration (in shares) |  | 206,250 |  |  |  |  |  |
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 |  |  |  |  |  |

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