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Note 5 - Derivative and Other Hedging Instruments - Schedule of Derivative Instruments Gain (Loss) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
(Losses) gains on derivative instruments | $ (122,669) | $ 133,554 | $ 45,237
Short [Member] | US Treasury Securities [Member] |  |  |
(Losses) gains on derivative instruments | (98) | 0 | 0
Treasury Note Future [Member] | Short [Member] |  |  |
(Losses) gains on derivative instruments | (30,282) | 26,638 | 32,650
Interest Rate Swap [Member] |  |  |
(Losses) gains on derivative instruments | (81,687) | 101,151 | 19,657
Payer Swaptions [Member] | Short [Member] |  |  |
(Losses) gains on derivative instruments | 0 | 0 | 4,113
Payer Swaptions [Member] | Long [Member] |  |  |
(Losses) gains on derivative instruments | 0 | (72) | (8,734)
Interest Rate Cap [Member] |  |  |
(Losses) gains on derivative instruments | 0 | 0 | (219)
Dual Digital Option [Member] |  |  |
(Losses) gains on derivative instruments | 0 | (500) | 0
Interest Rate Floor [Member] | Short [Member] |  |  |
(Losses) gains on derivative instruments | 0 | 0 | (525)
Interest Rate Floor [Member] | Long [Member] |  |  |
(Losses) gains on derivative instruments | 0 | 0 | 1,785
TBA Contracts [Member] | Short [Member] |  |  |
(Losses) gains on derivative instruments | (12,289) | 6,567 | 1,370
TBA Contracts [Member] | Long [Member] |  |  |
(Losses) gains on derivative instruments | $ 1,687 | $ (230) | $ (4,860)

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- Definition Aggregate net gain and losses (whether realized or unrealized) on all derivative instruments held for trading purposes whether or not settled physically. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4CC -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4CC + Details
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