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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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