Note 2 - Mortgage-backed Securities, at Fair Value (Details Textual) - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025
Notional Balance, Interest Only Securities Portfolio, Amount	$ 70.6	$ 72.9
Notional Balance, Inverse Interest Only Securities Portfolio, Amount	$ 15.2	$ 17.7

Represents the notional balance for the inverse interest only securities portfolio.

No definition available.

Name:	orc_NotionalBalanceInverseInterestOnlySecuritiesPortfolioAmount
Namespace Prefix:	orc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant