Note 13 - Related Party Transactions (Details Textual) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Bimini Advisors LLC [Member]
Automatic Renewal Period Of Management Agreement (Year)			1 year
Management Fee and Overhead Expense	$ 3.5	$ 3.3	$ 6.9	$ 6.4
Accounts Payable, Current	$ 1.2		$ 1.2		$ 1.1
Bimini Capital Management Inc [Member]
Entity Shares Owned (in shares)	569,071		569,071
Entity Ownership Percentage	1.30%		1.30%

Automatic renewal period of management agreement.

No definition available.

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Namespace Prefix:	orc_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Percent of the entity's common stock that is owned by another entity

+ References

No definition available.

+ Details

Name:	orc_EntityOwnershipPercentage
Namespace Prefix:	orc_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount of the entities shares that are owned by another entity

+ References

No definition available.

+ Details

Name:	orc_EntitySharesOwned
Namespace Prefix:	orc_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount of management fee and overhead expense recognized in period

+ References

No definition available.

+ Details

Name:	orc_ManagementFeeAndOverheadExpense
Namespace Prefix:	orc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 852
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 10
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481372/852-10-55-10

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(a))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=orc_BiminiAdvisorsLlcMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=orc_BiminiCapitalManagementIncMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: