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

The amount of implementation costs for the reporting period.

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Face (par) amount of debt instrument at time of issuance.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Amount of unrealized and realized gain (loss) on investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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Amortized amount of contract to service financial assets under which the benefits of servicing are expected to more than adequately compensate the servicer.

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