Cover - shares	3 Months Ended
	Mar. 31, 2024	May 15, 2024
Document Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Transition Report	false
Entity Interactive Data Current	Yes
Amendment Flag	false
Document Period End Date	Mar. 31, 2024
Document Fiscal Year Focus	2024
Document Fiscal Period Focus	Q1
Entity Information [Line Items]
Entity Registrant Name	OCA ACQUISITION CORP.
Entity Central Index Key	0001820175
Entity File Number	001-39901
Entity Tax Identification Number	85-2218652
Entity Incorporation, State or Country Code	DE
Current Fiscal Year End Date	--12-31
Entity Current Reporting Status	Yes
Entity Shell Company	true
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	true
Entity Ex Transition Period	false
Entity Contact Personnel [Line Items]
Entity Address, Address Line One	1345 Avenue of the Americas
Entity Address, Address Line Two	33rd Floor
Entity Address, City or Town	NY
Entity Address, State or Province	NY
Entity Address, Postal Zip Code	10105
Entity Phone Fax Numbers [Line Items]
City Area Code	(212)
Local Phone Number	201-8533
Units, each consisting of one share of Class A common stock, par value $0.0001 per share, and one-half of one Redeemable Warrant
Entity Listings [Line Items]
Title of 12(b) Security	Units, each consisting of one share of Class A common stock, par value $0.0001 per share, and one-half of one Redeemable Warrant
Trading Symbol	OCAXU
Security Exchange Name	NASDAQ
Shares of Class A common stock, par value $0.0001 per share, included as part of the units
Entity Listings [Line Items]
Title of 12(b) Security	Shares of Class A common stock, par value $0.0001 per share, included as part of the units
Trading Symbol	OCAX
Security Exchange Name	NASDAQ
Redeemable Warrants included as part of the units
Entity Listings [Line Items]
Title of 12(b) Security	Redeemable Warrants included as part of the units
Trading Symbol	OCAXW
Security Exchange Name	NASDAQ
Class A Common Stock
Entity Listings [Line Items]
Entity Common Stock, Shares Outstanding		3,298,436
Class B Common Stock
Entity Listings [Line Items]
Entity Common Stock, Shares Outstanding		3,437,500