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Note 19 - Subsequent Events (Details Textual) - Subsequent Event [Member] - Business Combination Agreement with SHG [Member]
$ / shares in Units, $ in Millions
Aug. 02, 2021
USD ($)
$ / shares
shares
Business Acquisition, Implied Pro Forma Equity Market Value of the Combined Company at Closing $ 777
Business Acquisition, Agreed Amount of Financing in Support of Transaction 55
Business Acquisition, Financing in Support of Transaction, Minimum Bond Proceeds Required to Be Raised by Acquiree 80
Business Acquisition, Additional Funding Expected to Be Raised By the Parties Involved Through a Private Placement Investment 100
Business Acquisition, Backstop Agreed to Be Provided to Acquiree, Maximum Value $ 45
Business Acquisition, Backstop Agreed to Be Provided to Acquiree, Price Per Share (in dollars per share) | $ / shares $ 10
Business Acquisition, Minimum Investment Condition in Cash and Securities at Closing $ 150
Business Acquisition, Gross Proceeds Expected to Be Received By the Combined Company $ 238
Business Acquisition, Percentage of Equity in the Combined Company to Be Retained By the Acquiree's Equityholders 100.00%
Business Acquisition, Private Activity Bond Proceeds Raised by Acquiree, Expected to Close in Fulfillment of Business Combination Requirements $ 80
Common Class A [Member]  
Business Acquisition, Additional Financing in Support of Transaction, Number of Shares into which the Additional Equity Investment Will Be Converted (in shares) | shares 5,500,000
Business Acquisition, Additional Financing in Support of Transaction, Shares into which the Additional Equity Investment Will Be Converted, Price Per Share (in dollars per share) | $ / shares $ 10