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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.

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