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Note 6 - Convertible Senior Notes - Schedule of Debt Interest Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Convertible Senior Notes 2023 [Member]
Contractual interest expense	$ 5,195	$ 5,938	$ 5,938
Amortization of debt issuance costs	619	663	618
Total interest expense	5,814	6,601	6,556
Convertible Senior Notes 2026 [Member]
Contractual interest expense	11,774	11,814	11,814
Amortization of debt issuance costs	1,355	1,167	1,078
Total interest expense	$ 13,129	$ 12,981	$ 12,892

X

- Definition

Amount of amortization expense attributable to debt issuance costs.

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Amount of the cost of borrowed funds accounted for as interest expense for debt.

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