Note 6 - Debt - Schedule of Debt Interest Expense (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Initial Term Loan [Member]
Contractual interest expense	$ 2,433,000		$ 3,147,000
Amortization of premium and debt issuance costs	(2,060)		(2,659)
Total interest expense	373,000		488,000
Convertible Senior Notes 2023 [Member]
Contractual interest expense	0	$ 1,484,000	0	$ 4,453,000
Total interest expense	0	1,663,000	0	4,981,000
Amortization of debt issuance costs	0	179,000	0	528,000
Convertible Senior Notes 2026 [Member]
Contractual interest expense	1,284,000	2,954,000	6,488,000	8,861,000
Total interest expense	1,428,000	3,266,000	7,201,000	9,783,000
Amortization of debt issuance costs	$ 144,000	$ 312,000	$ 713,000	$ 922,000