Note 1 - Organization and Significant Accounting Policies (Details Textual) - USD ($)							2 Months Ended		3 Months Ended	5 Months Ended	9 Months Ended	12 Months Ended				16 Months Ended	17 Months Ended
		Oct. 27, 2025	Feb. 24, 2025	Jun. 11, 2024	Mar. 07, 2023	Oct. 29, 2021	Feb. 20, 2026	Dec. 31, 2025	Oct. 31, 2025	Jul. 28, 2025	Feb. 28, 2025	Dec. 31, 2025		Dec. 31, 2024	Dec. 31, 2023	Jun. 30, 2024	Mar. 31, 2023
Stock Issued During Period, Shares, New Issues (in shares)	[1]											100,429,631
Stock Issued During Period, Value, New Issues												$ 741,423,000	[1],[2]	$ 259,328,000	$ 159,438,000
Proceeds from Issuance of Common Stock												$ 741,423,000		$ 259,328,000	$ 159,438,000
October 2021 Equity Distribution Agreement [Member]
Equity Agreement, Maximum Shares Issuable, Value						$ 250,000,000
Stock Issued During Period, Shares, New Issues (in shares)																	9,742,188
Stock Issued During Period, Value, New Issues																	$ 151,800,000
Proceeds from Issuance of Common Stock																	$ 149,300,000
March 2023 Equity Distribution Agreement [Member]
Equity Agreement, Maximum Shares Issuable, Value					$ 250,000,000
Stock Issued During Period, Shares, New Issues (in shares)																24,675,497
Stock Issued During Period, Value, New Issues																$ 228,800,000
Proceeds from Issuance of Common Stock																$ 225,000,000
June 2024 Equity Distribution Agreement [Member]
Equity Agreement, Maximum Shares Issuable, Value				$ 250,000,000
Stock Issued During Period, Shares, New Issues (in shares)											30,513,253
Stock Issued During Period, Value, New Issues											$ 250,000,000
Proceeds from Issuance of Common Stock											$ 245,800,000
February 2025 Equity Distribution Agreement [Member]
Equity Agreement, Maximum Shares Issuable, Value			$ 350,000,000						$ 500,000,000
Stock Issued During Period, Shares, New Issues (in shares)									59,492,504
Stock Issued During Period, Value, New Issues									$ 445,100,000
Proceeds from Issuance of Common Stock									$ 438,000,000
Equity Agreement, Maximum Shares Issuable, Value, Increase (Decrease)										$ 150,000,000
October 2025 Equity Distribution Agreement [Member]
Equity Agreement, Maximum Shares Issuable, Value		$ 500,000,000
Stock Issued During Period, Shares, New Issues (in shares)								30,265,963
Stock Issued During Period, Value, New Issues								$ 223,100,000
Proceeds from Issuance of Common Stock								$ 219,700,000
October 2025 Equity Distribution Agreement [Member] | Subsequent Event [Member]
Stock Issued During Period, Shares, New Issues (in shares)							8,707,492
Stock Issued During Period, Value, New Issues							$ 66,200,000
Proceeds from Issuance of Common Stock							$ 65,200,000

[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.