Note 1 - Nature of the Business and Summary of Significant Accounting Policies (Details Textual) - USD ($) $ in Thousands		3 Months Ended		12 Months Ended
	Mar. 10, 2022	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022	Sep. 02, 2020
Payments to Acquire Equity Method Investments		$ (0)	$ 3,294
Equity Method Investments		0		$ 25,418
Cash and Cash Equivalents, at Carrying Value		337,143		132,735
Implementation Costs		9,061		$ 9,444
US Treasury Securities [Member]
Cash and Cash Equivalents, at Carrying Value		24,732
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]
Payments to Acquire Equity Method Investments	$ 3,300
Equity Method Investment, Ownership Percentage					19.00%
Equity Method Investments	$ 31,200