v3.26.1
Document And Entity Information - shares
3 Months Ended
Mar. 31, 2026
May 01, 2026
Document Information [Line Items]    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Mar. 31, 2026  
Document Transition Report false  
Entity File Number 001-34142  
Entity Registrant Name OAK VALLEY BANCORP  
Entity Incorporation, State or Country Code CA  
Entity Tax Identification Number 26-2326676  
Entity Address, Address Line One 125 N. Third Ave.  
Entity Address, City or Town Oakdale  
Entity Address, State or Province CA  
Entity Address, Postal Zip Code 95361  
City Area Code 209  
Local Phone Number 848-2265  
Title of 12(b) Security Common Stock  
Trading Symbol OVLY  
Security Exchange Name NASDAQ  
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  
Entity Common Stock, Shares Outstanding (in shares)   8,413,458
Entity Central Index Key 0001431567  
Current Fiscal Year End Date --12-31  
Document Fiscal Year Focus 2026  
Document Fiscal Period Focus Q1  
Amendment Flag false