Note 8 - Capital Stock - Issuance of Common Stock (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended								9 Months Ended		12 Months Ended
		Sep. 30, 2025	Jun. 30, 2025	Mar. 31, 2025		Dec. 31, 2024	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Sep. 30, 2025		Dec. 31, 2024
Issuance of common stock pursuant to public offerings, net (in shares)	[1]									66,690,909		31,327,547
Issuance of common stock pursuant to public offerings, net		$ 152,345	$ 139,416	$ 205,424			$ 109,891	$ 100,698	$ 13,109	$ 497,185	[1],[2]	$ 259,328	[1],[2]
At the Market Offering Program [Member]
Price per share (in dollars per share)	[1],[3]	$ 7.03	$ 7.01	$ 8.17	[4]	$ 7.86	$ 8.25	$ 8.4	$ 8.8	$ 7.03		$ 7.86
Issuance of common stock pursuant to public offerings, net (in shares)	[1]	21,664,659	19,884,204	25,142,046		4,533,067	13,314,022	11,990,383	1,490,075
Issuance of common stock pursuant to public offerings, net	[1],[2]	$ 152,345	$ 139,416	$ 205,424		$ 35,630	$ 109,891	$ 100,698	$ 13,109

[1] The Company has entered into 13 equity distribution agreements, 12 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.

[4] 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.