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Note 2 - Mortgage-backed Securities and U.S. Treasury Securities, at Fair Value - Schedule of RMBS Portfolio (Details) - USD ($) $ in Thousands | Dec. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Mortgage-backed securities, par value |  | $ 10,345,029 | $ 5,431,274
Mortgage-backed securities, cost | [1] | 10,574,339 | 5,559,428
Pledged assets, Mortgage-backed securities |  | 10,628,658 | 5,253,310
Fixed Rate Mortgages [Member] |  |  |
Mortgage-backed securities, par value |  | 10,345,029 | 5,431,274
Mortgage-backed securities, cost | [1] | 10,558,236 | 5,540,596
Pledged assets, Mortgage-backed securities |  | 10,615,570 | 5,237,812
Financial Instrument, Other [Member] |  |  |
Mortgage-backed securities, par value |  | 0 | 0
Mortgage-backed securities, cost | [1] | 16,103 | 18,832
Pledged assets, Mortgage-backed securities |  | $ 13,088 | $ 15,498
[1] | The cost information in the table above represents the aggregate current par value, multiplied by the purchase price of each security in the portfolio.

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- Definition Represents Financial Instruments, Owned Mortgages, Mortgage-Backed and Asset-Backed Securities, at Par Value. + References No definition available. + Details
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- Definition The fair value as of the balance sheet date of firm holdings in mortgages, mortgage backed securities (investment instruments that represent ownership of an undivided interest in a group of mortgages, where principal and interest from the individual mortgages are used to pay investors' principal and interest on the mortgage backed security) and asset-backed securities that are primarily paid from the cash flows of a discrete pool of receivables or other financial assets (such as credit-card receivables), either fixed or revolving, that by their terms convert into cash within a finite time period. Includes both pledged (to counterparties as collateral for financing transactions) and unpledged holdings. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 940 -SubTopic 320 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479035/940-320-45-2 + Details
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