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Note 6 - Convertible Senior Notes (Details Textual) $ / shares in Units, $ in Thousands		12 Months Ended
	Dec. 19, 2024 USD ($) $ / shares	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Proceeds from Notes Payable		$ 169,266	$ 0	$ 0
Payments of Debt Issuance Costs		3,234
Convertible Senior Notes [Member]
Payments of Debt Issuance Costs		1,507	$ (0)	$ (0)
Debt Instrument, Unamortized Discount		4,728
Convertible Senior Notes [Member] \| U S Bank Trust Company, National Association [Member]
Debt Instrument, Face Amount	$ 172,500
Proceeds from Notes Payable	167,700
Payments of Debt Issuance Costs	$ 4,800
Debt Instrument, Interest Rate, Stated Percentage	2.50%
Debt Instrument, Convertible, Conversion Ratio	8.3521
Debt Instrument, Convertible, Conversion Price (in dollars per share) \| $ / shares	$ 119.73
Debt Instrument, Unamortized Discount	$ 4,800
Interest Expense, Debt		$ 200
Debt Instrument, Interest Rate, Effective Percentage		3.10%
Long-Term Debt, Fair Value		$ 178,600