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Document And Entity Information - USD ($)
Dec. 31, 2020
Mar. 29, 2021
Jun. 30, 2020
Document Information [Line Items]      
Entity, Registrant Name DYADIC INTERNATIONAL, INC.    
Current Fiscal Year End Date --12-31    
Document, Fiscal Period Focus FY    
Document, Fiscal Year Focus 2020    
Document, Type 10-K/A    
Document, Annual Report true    
Document, Period End Date Dec. 31, 2020    
Document, Transition Report false    
Entity, File Number 000-55264    
Entity, Incorporation, State or Country Code DE    
Entity, Tax Identification Number 45-0486747    
Entity, Address, Address Line One 140 Intracoastal Pointe Drive, Suite 404    
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, Well-known Seasoned Issuer No    
Entity, Voluntary Filers No    
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, Public Float     $ 238,000,000
Entity, Common Stock Shares, Outstanding   27,554,157  
Documents Incorporated By Reference Text Block The information required by Part III of this Report, to the extent not set forth herein, is incorporated in this Report by reference to the Registrant’s definitive proxy statement relating to the 2021 annual meeting of shareholders.    
Amendment Description Dyadic International, Inc. (the “Company”) is filing this Amendment No. 1 on Form 10-K/A (the “Amendment”) to the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2020 (the “Form 10-K”), which the Company filed with the Securities and Exchange Commission on March 30, 2021. This Amendment is being filed solely to include Exhibit 23.1 to the Form 10‑K, which was inadvertently omitted. This Amendment also includes new certifications pursuant to Sections 302 and 906 of the Sarbanes-Oxley Act of 2002.    
Amendment Flag true    
Entity, Central Index Key 0001213809