Note 13 - Fair Value - Schedule of Fair Value Assets and Liabilities Measured on Recurring Basis (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Mortgage-backed securities, at fair value (includes pledged assets of $11,259,049 and $10,502,743, respectively)	$ 11,338,541	$ 10,628,658
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
Derivative liability, fair value	0
Fair Value, Inputs, Level 1 [Member] \| Fair Value, Recurring [Member] \| Reverse Repurchase Agreement [Member]
Derivative liability, fair value
Derivative liability, fair value
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 $11,259,049 and $10,502,743, 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 $11,259,049 and $10,502,743, respectively)	0
Derivative asset, fair value		0
Fair Value, Inputs, Level 2 [Member] \| Fair Value, Recurring [Member] \| Interest Rate Swap [Member]
Derivative assets, at fair value	2,628	8,238
Fair Value, Inputs, Level 2 [Member] \| Fair Value, Recurring [Member] \| TBA Contracts [Member]
Derivative assets, at fair value		(831)
Derivative liability, fair value	(254)
Derivative liability, fair value	(254)
Fair Value, Inputs, Level 2 [Member] \| Fair Value, Recurring [Member] \| Reverse Repurchase Agreement [Member]
Derivative liability, fair value	(359,202)	(128,724)
Derivative liability, fair value	(359,202)	(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 $11,259,049 and $10,502,743, respectively)	11,338,541	10,628,658
Fair Value, Inputs, Level 2 [Member] \| Fair Value, Recurring [Member] \| US Treasury Securities [Member]
Mortgage-backed securities, at fair value (includes pledged assets of $11,259,049 and $10,502,743, respectively)	155,095
Derivative asset, fair value		135,133
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
Derivative liability, fair value	0
Fair Value, Inputs, Level 3 [Member] \| Fair Value, Recurring [Member] \| Reverse Repurchase Agreement [Member]
Derivative liability, fair value
Derivative liability, fair value
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 $11,259,049 and $10,502,743, 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 $11,259,049 and $10,502,743, 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.

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 210
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 22
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483444/210-20-55-22

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 7A
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480434/815-10-50-7A

Reference 3: http://www.xbrl.org/2003/role/exampleRef
-Topic 210
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 21
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483444/210-20-55-21

Reference 4: http://www.xbrl.org/2003/role/exampleRef
-Topic 210
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 20
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483444/210-20-55-20

Reference 5: http://www.xbrl.org/2003/role/exampleRef
-Topic 210
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 15
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483444/210-20-55-15

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 210
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483466/210-20-50-3

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- Definition

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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- 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

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- Definition

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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