Note 8 - Capital Stock - Issuance of Common Stock (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended													4 Months Ended	12 Months Ended
		Dec. 31, 2024	[1]	Sep. 30, 2024	[1]	Jun. 30, 2024	[1]	Mar. 31, 2024	[1]	Sep. 30, 2023	[1]	Jun. 30, 2023	Mar. 31, 2023	[1]	Oct. 31, 2023	Dec. 31, 2024		Dec. 31, 2023		Dec. 31, 2022
Issuance of common stock pursuant to public offerings, net (in shares)	[1]															31,327,547		15,880,039
Issuance of common stock pursuant to public offerings, net																$ 259,328	[1],[2]	$ 159,438	[1],[2]	$ 40,580
At the Market Offering Program [Member]
Price per share (in dollars per share)		$ 7.86	[3]	$ 8.25	[3]	$ 8.4	[3]	$ 8.8	[3]	$ 9.95	[3]	$ 9.54	$ 11.77	[3]	$ 0	$ 7.86	[1],[3]
Issuance of common stock pursuant to public offerings, net (in shares)		4,533,067		13,314,022		11,990,383		1,490,075		4,757,953		8,432,086	2,690,000		0
Issuance of common stock pursuant to public offerings, net		$ 35,630	[2]	$ 109,891	[2]	$ 100,698	[2]	$ 13,109	[2]	$ 47,355	[2]	$ 80,426	$ 31,657	[2]	$ 0

[1] As of December 31, 2024, the Company had entered into twelve equity distribution agreements, eleven of which have either been terminated because all shares were sold or were replaced with a subsequent agreement.

[2] Net proceeds are net of the underwriters’ discount, if applicable, and other offering costs.

[3] Weighted average price received per share is after deducting the underwriters’ discount, if applicable, and other offering costs.