Note 7 - Convertible Senior Notes - Schedule of Fair Value for Convertible Notes (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Total		$ 2,785	$ 5,208	$ 2,882
Convertible Senior Notes Maturing April 1, 2028 [Member]
Convertible Debt	[1]	393,074
Convertible Debt, Fair Value Disclosures		581,613
March 2023 Note [Member] | Convertible Senior Notes [Member]
Contractual interest expense		9,426
Amortization of issuance costs		1,582
Total		$ 11,008

[1] The carrying amounts presented are net of unamortized debt issuance costs of $9,426 as of December 31, 2023.