| Cover | Jan. 20, 2025 |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Jan. 20, 2025 |
| Entity File Number | 001-39901 |
| Entity Registrant Name | OCA Acquisition Corp. |
| Entity Central Index Key | 0001820175 |
| Entity Tax Identification Number | 85-2218652 |
| Entity Incorporation, State or Country Code | DE |
| Entity Address, Address Line One | 1345 Avenue of the Americas |
| Entity Address, Address Line Two | 33rd Floor |
| Entity Address, City or Town | New York |
| Entity Address, State or Province | NY |
| Entity Address, Postal Zip Code | 10105 |
| City Area Code | 212 |
| Local Phone Number | 201-8533 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | true |
| Elected Not To Use the Extended Transition Period | false |
| Units, each consisting of one share of Class A Common Stock, par value $0.0001 per share, and one-half of one Redeemable Warrant | |
| 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 |
| Class A Common Stock, par value $0.0001 per share, included as part of the Units | |
| Title of 12(b) Security | Class A Common Stock, par value $0.0001 per share, included as part of the Units |
| Trading Symbol | OCAX |
| Redeemable Warrants included as part of the Units, each whole warrant exercisable for one share of Class A Common Stock at an exercise price of $11.50 | |
| Title of 12(b) Security | Redeemable Warrants included as part of the Units, each whole warrant exercisable for one share of Class A Common Stock at an exercise price of $11.50 |
| Trading Symbol | OCAXW |
