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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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