Note 1 - Nature of the Business and Summary of Significant Accounting Policies (Details Textual) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023	Mar. 10, 2022
Equity Securities, FV-NI, Gain (Loss)	$ 9,918	$ 0
Cash and Cash Equivalents, at Carrying Value	257,894		$ 296,871
Implementation Costs	9,827		9,895
US Treasury Securities [Member]
Cash and Cash Equivalents, at Carrying Value	99,661		134,570
Servicing Asset at Amortized Cost	361		692
March 2023 Note [Member] | Convertible Senior Notes [Member]
Debt Instrument, Face Amount		$ 402,500
Debt Instrument, Interest Rate, Stated Percentage		3.00%
Privately Held Company, Not Primary Beneficiary [Member]
Equity Method Investments	33,446		$ 23,528	$ 31,200
Equity Securities, FV-NI, Gain (Loss)	$ 9,918