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Note 6 - Pledged Assets (Tables) | 12 Months Ended
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Dec. 31, 2025
Notes Tables |
Schedule of Financial Instruments Owned and Pledged as Collateral [Table Text Block] |
(in thousands) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
|  | December 31, 2025 |  |  | December 31, 2024 |
|  | Repurchase |  |  | Derivative |  |  |  |  |  |  | Repurchase |  |  | Derivative |  |  |  |  |
Assets Pledged to Counterparties |  | Agreements |  |  | Agreements |  |  | Total |  |  | Agreements |  |  | Agreements |  |  | Total |
PT RMBS - fair value |  | $ | 10,489,655 |  |  | $ | - |  |  | $ | 10,489,655 |  |  | $ | 5,193,570 |  |  | $ | - |  |  | $ | 5,193,570 |
Structured RMBS - fair value |  |  | 13,088 |  |  |  | - |  |  |  | 13,088 |  |  |  | 15,498 |  |  |  | - |  |  |  | 15,498 |
U.S. Treasury securities - fair value |  |  | - |  |  |  | 135,133 |  |  |  | 135,133 |  |  |  | - |  |  |  | 100,551 |  |  |  | 100,551 |
Accrued interest on pledged securities |  |  | 48,537 |  |  |  | 36 |  |  |  | 48,573 |  |  |  | 22,852 |  |  |  | - |  |  |  | 22,852 |
Restricted cash |  |  | 51,171 |  |  |  | 7,525 |  |  |  | 58,696 |  |  |  | 22,818 |  |  |  | 2,905 |  |  |  | 25,723 |
Total |  | $ | 10,602,451 |  |  | $ | 142,694 |  |  | $ | 10,745,145 |  |  | $ | 5,254,738 |  |  | $ | 103,456 |  |  | $ | 5,358,194 |
Schedule of Financial Instruments Pledged as Collateral From Counterparties [Table Text Block] |
(in thousands) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
|  |  |  |  |  | Reverse |  |  |  |  |  |  |  |  |
|  | Repurchase |  |  | Repurchase |  |  | Derivative |  |  |  |  |
|  | Agreements |  |  | Agreements |  |  | Agreements |  |  | Total |
December 31, 2025 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash |  | $ | 12,549 |  |  | $ | - |  |  | $ | 360 |  |  | $ | 12,909 |
U.S. Treasury securities - fair value |  |  | - |  |  |  | 128,724 |  |  |  | - |  |  |  | 128,724 |
Total |  | $ | 12,549 |  |  | $ | 128,724 |  |  | $ | 360 |  |  | $ | 141,633 |
December 31, 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash |  | $ | 4,465 |  |  | $ | - |  |  | $ | 4,282 |  |  | $ | 8,747 |
U.S. Treasury securities - fair value |  |  | 4,146 |  |  |  | - |  |  |  | - |  |  |  | 4,146 |
Total |  | $ | 8,611 |  |  | $ | - |  |  | $ | 4,282 |  |  | $ | 12,893 |

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- Definition Tabular disclosure of financial instruments held by the entity for its own account for trading or investment purposes that are carried at fair value and pledged to counterparties as collateral for financing transactions. Description may include equity, fixed income, debt or other securities. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 860 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481444/860-30-45-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 860 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 1A -Publisher FASB -URI https://asc.fasb.org/1943274/2147481420/860-30-50-1A + Details
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