Note 13 - Fair Value - Schedule of Fair Value Assets and Liabilities Measured on Recurring Basis (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Mortgage-backed securities, at fair value (includes pledged assets of $10,502,743 and $5,209,068, respectively)	$ 10,628,658	$ 5,253,310
Fair Value, Inputs, Level 1 [Member] \| Fair Value, Recurring [Member] \| Interest Rate Swap [Member]
Derivative assets, at fair value	0	0
Fair Value, Inputs, Level 1 [Member] \| Fair Value, Recurring [Member] \| TBA Contracts [Member]
Derivative assets, at fair value		0
Derivative liability, fair value	0
Fair Value, Inputs, Level 1 [Member] \| Fair Value, Recurring [Member] \| Reverse Repurchase Agreement [Member]
Derivative liability, fair value	0
Fair Value, Inputs, Level 1 [Member] \| Fair Value, Recurring [Member] \| Collateralized Mortgage-Backed Securities [Member]
Mortgage-backed securities, at fair value (includes pledged assets of $10,502,743 and $5,209,068, respectively)	0	0
Fair Value, Inputs, Level 1 [Member] \| Fair Value, Recurring [Member] \| US Treasury Securities [Member]
Mortgage-backed securities, at fair value (includes pledged assets of $10,502,743 and $5,209,068, respectively)	0
Derivative asset, fair value		100,551
Fair Value, Inputs, Level 2 [Member] \| Fair Value, Recurring [Member] \| Interest Rate Swap [Member]
Derivative assets, at fair value	8,237	4,574
Fair Value, Inputs, Level 2 [Member] \| Fair Value, Recurring [Member] \| TBA Contracts [Member]
Derivative assets, at fair value		4,371
Derivative liability, fair value	(831)
Fair Value, Inputs, Level 2 [Member] \| Fair Value, Recurring [Member] \| Reverse Repurchase Agreement [Member]
Derivative liability, fair value	(128,724)
Fair Value, Inputs, Level 2 [Member] \| Fair Value, Recurring [Member] \| Collateralized Mortgage-Backed Securities [Member]
Mortgage-backed securities, at fair value (includes pledged assets of $10,502,743 and $5,209,068, respectively)	10,628,658	5,253,310
Fair Value, Inputs, Level 2 [Member] \| Fair Value, Recurring [Member] \| US Treasury Securities [Member]
Mortgage-backed securities, at fair value (includes pledged assets of $10,502,743 and $5,209,068, respectively)	135,133
Derivative asset, fair value		0
Fair Value, Inputs, Level 3 [Member] \| Fair Value, Recurring [Member] \| Interest Rate Swap [Member]
Derivative assets, at fair value	0	0
Fair Value, Inputs, Level 3 [Member] \| Fair Value, Recurring [Member] \| TBA Contracts [Member]
Derivative assets, at fair value		0
Derivative liability, fair value	0
Fair Value, Inputs, Level 3 [Member] \| Fair Value, Recurring [Member] \| Reverse Repurchase Agreement [Member]
Derivative liability, fair value	0
Fair Value, Inputs, Level 3 [Member] \| Fair Value, Recurring [Member] \| Collateralized Mortgage-Backed Securities [Member]
Mortgage-backed securities, at fair value (includes pledged assets of $10,502,743 and $5,209,068, respectively)	0	0
Fair Value, Inputs, Level 3 [Member] \| Fair Value, Recurring [Member] \| US Treasury Securities [Member]
Mortgage-backed securities, at fair value (includes pledged assets of $10,502,743 and $5,209,068, respectively)	$ 0
Derivative asset, fair value		$ 0

Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

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Fair value, before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

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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.

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The fair value as of the balance sheet date of firm holdings in debt obligations issued by the US government including short-term Treasury bills, medium-term Treasury notes, and long-term Treasury bonds, as well as debt issued by agencies. Includes both pledged (to counterparties as collateral for financing transactions) and unpledged holdings.

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