Note 7 - Purchase of Capped Call Option (Details Textual) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended
	Mar. 15, 2023	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Payments to Acquire Capped Call Options		$ 66,211	$ (0)
Interest Payable, Current		331		$ 922
Capped Call Transactions [Member]
Capped Call Transactions, Cap Price (in dollars per share)	$ 120.23
Share Price (in dollars per share)	$ 54.65
March 2023 Note [Member] | Convertible Senior Notes [Member] | Capped Call Transactions [Member]
Payments to Acquire Capped Call Options		66,211
Credit Facility [Member]
Interest Payable, Current		$ 0		$ 922