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Document And Entity Information - shares
 6 Months Ended
Jun. 30, 2025
Aug. 08, 2025
Document Information [Line Items]    
Document Type 10-Q/A  
Document Quarterly Report true  
Document Period End Date Jun. 30, 2025  
Document Transition Report false  
Entity File Number 001-38999  
Entity Registrant Name BioCardia, Inc.  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 23-2753988  
Entity Address, Address Line One 320 Soquel Way  
Entity Address, City or Town Sunnyvale  
Entity Address, State or Province CA  
Entity Address, Postal Zip Code 94085  
City Area Code 650  
Local Phone Number 226-0120  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Non-accelerated Filer  
Entity Small Business true  
Entity Emerging Growth Company false  
Entity Shell Company false  
Title of 12(b) Security Common Stock, par value $0.001  
Trading Symbol BCDA  
Security Exchange Name NASDAQ  
Entity Common Stock, Shares Outstanding (in shares)   5,801,224
Amendment Description AMENDMENT OF QUARTERLY REPORT SOLELY BECAUSE PRINCIPAL OFFICER CERTIFICATIONS WERE INADVERTENTLY OMMITTED IN THE ORIGINAL FILING   This Amendment No. 1 to the Quarterly Report on Form 10-Q/A (the Amendment) amends our Quarterly Report on Form 10-Q filed on August 11, 2025 (the Original Filing) which inadvertently omitted the Exhibit 32.1 and Exhibit 32.2 Certifications of the Principal Executive Officer and the Principal Financial Officer pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 (the Certifications). The Certifications are included with this Amendment. With the exception of the inclusion of the Certifications and currently dated certifications of the Company’s Principal Executive Officer and Principal Financial Officer as required by Section 302 of the Sarbanes Oxley Act of 2002, there were no changes to the Original Filing. All references to the Form 10-Q in this Report shall refer to this Form 10-Q/A.   Except as described above, this Amendment does not amend, update or change any other items or disclosures in the Original Filing and does not purport to reflect any information or events subsequent to the filing of the Original Filing. As such, this Amendment only speaks as of the date the Original Filing was filed, and we have not undertaken herein to amend, supplement or update any information contained in the Original Filing to give effect to any subsequent events. Accordingly, this Amendment should be read in conjunction with the Company’s filings made with the SEC subsequent to the filing of the Original Filing, including any amendments to those filings.  
Entity Central Index Key 0000925741  
Current Fiscal Year End Date --12-31  
Document Fiscal Year Focus 2025  
Document Fiscal Period Focus Q2  
Amendment Flag true