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Note 1 - Nature of the Business and Summary of Significant Accounting Policies (Details Textual) - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Mar. 10, 2022
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2022
Mar. 31, 2023
Payments to Acquire Equity Method Investments   $ (0) $ 3,294    
Equity Method Investments   0   $ 25,418  
Cash and Cash Equivalents, at Carrying Value   244,048   132,735  
Short-Term Investments   114,437   0  
Investment Income, Amortization of Discount   996 $ (0)    
Implementation Costs   8,678   $ 9,444  
US Treasury Securities [Member]          
Cash and Cash Equivalents, at Carrying Value   49,766      
Servicing Asset at Amortized Cost   358      
March 2023 Note [Member] | Convertible Senior Notes [Member]          
Debt Instrument, Face Amount   $ 402,500     $ 402,500
Debt Instrument, Interest Rate, Stated Percentage   3.00% [1]     3.00%
Privately Held Company, Not Primary Beneficiary [Member]          
Payments to Acquire Equity Method Investments $ 3,300        
Equity Method Investment, Ownership Percentage 19.00%        
Equity Method Investments $ 31,200        
[1] The carrying amounts presented are net of unamortized debt issuance costs of $10,618 as of June 30, 2023.