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Cover - shares
 6 Months Ended
Jun. 30, 2025
Aug. 12, 2025
Cover [Abstract]    
Document Type 10-Q  
Amendment Flag false  
Document Quarterly Report true  
Document Transition Report false  
Document Period End Date Jun. 30, 2025  
Document Fiscal Period Focus Q2  
Document Fiscal Year Focus 2025  
Current Fiscal Year End Date --12-31  
Entity File Number 001-32513  
Entity Registrant Name DYADIC INTERNATIONAL, INC.  
Entity Central Index Key 0001213809  
Entity Tax Identification Number 45-0486747  
Entity Incorporation, State or Country Code DE  
Entity Address, Address Line One 1044 North U.S. Highway One  
Entity Address, Address Line Two Suite 201  
Entity Address, City or Town Jupiter  
Entity Address, State or Province FL  
Entity Address, Postal Zip Code 33477  
City Area Code (561)  
Local Phone Number 743-8333  
Title of 12(b) Security Common Stock, par value $0.001 per share  
Trading Symbol DYAI  
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   36,187,798