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Note 6 - Pledged Assets - Schedule of Financial Instruments Owned and Pledged as Collateral (Details) - USD ($) $ in Thousands | Dec. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Accrued interest receivable | $ 49,127 | $ 23,044
Restricted cash | 58,696 | 25,723
Asset Pledged as Collateral [Member] |  |
Accrued interest receivable | 48,573 | 22,852
Restricted cash | 58,696 | 25,723
Total | 10,745,145 | 5,358,194
Asset Pledged as Collateral [Member] | Residential Mortgage-Backed Securities [Member] | Pass Through Certificate [Member] |  |
Investment at fair value | 10,489,655 | 5,193,570
Asset Pledged as Collateral [Member] | Residential Mortgage-Backed Securities [Member] | Structured Finance [Member] |  |
Investment at fair value | 13,088 | 15,498
Asset Pledged as Collateral [Member] | US Treasury Securities [Member] |  |
Investment at fair value | 135,133 | 100,551
Asset Pledged as Collateral [Member] | Repurchase Agreements [Member] |  |
Accrued interest receivable | 48,537 | 22,852
Restricted cash | 51,171 | 22,818
Total | 10,602,451 | 5,254,738
Asset Pledged as Collateral [Member] | Repurchase Agreements [Member] | Residential Mortgage-Backed Securities [Member] | Pass Through Certificate [Member] |  |
Investment at fair value | 10,489,655 | 5,193,570
Asset Pledged as Collateral [Member] | Repurchase Agreements [Member] | Residential Mortgage-Backed Securities [Member] | Structured Finance [Member] |  |
Investment at fair value | 13,088 | 15,498
Asset Pledged as Collateral [Member] | Repurchase Agreements [Member] | US Treasury Securities [Member] |  |
Investment at fair value | 0 | 0
Asset Pledged as Collateral [Member] | Derivative [Member] |  |
Accrued interest receivable | 36 | 0
Restricted cash | 7,525 | 2,905
Total | 142,694 | 103,456
Asset Pledged as Collateral [Member] | Derivative [Member] | Residential Mortgage-Backed Securities [Member] | Pass Through Certificate [Member] |  |
Investment at fair value | 0 | 0
Asset Pledged as Collateral [Member] | Derivative [Member] | Residential Mortgage-Backed Securities [Member] | Structured Finance [Member] |  |
Investment at fair value | 0 | 0
Asset Pledged as Collateral [Member] | Derivative [Member] | US Treasury Securities [Member] |  |
Investment at fair value | $ 135,133 | $ 100,551

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