Annual report pursuant to Section 13 and 15(d)

Document And Entity Information

Document And Entity Information - USD ($)
12 Months Ended
Dec. 31, 2021
Mar. 11, 2022
Jun. 30, 2020
Document Information Line Items      
Entity Registrant Name ALTO INGREDIENTS, INC.    
Trading Symbol ALTO    
Document Type 10-K    
Current Fiscal Year End Date --12-31    
Entity Common Stock, Shares Outstanding   73,726,517  
Entity Public Float     $ 431,100,000
Amendment Flag false    
Entity Central Index Key 0000778164    
Entity Current Reporting Status Yes    
Entity Voluntary Filers No    
Entity Filer Category Accelerated Filer    
Entity Well-known Seasoned Issuer No    
Document Period End Date Dec. 31, 2021    
Document Fiscal Year Focus 2021    
Document Fiscal Period Focus FY    
Entity Small Business false    
Entity Emerging Growth Company false    
Entity Shell Company false    
ICFR Auditor Attestation Flag true    
Document Annual Report true    
Document Transition Report false    
Entity File Number 000-21467    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 41-2170618    
Entity Address, Address Line One 1300 South Second Street    
Entity Address, City or Town Pekin    
Entity Address, State or Province IL    
Entity Address, Postal Zip Code 61554    
City Area Code (916)    
Local Phone Number 403-2123    
Title of 12(b) Security Common Stock, $0.001 par value    
Security Exchange Name NASDAQ    
Entity Interactive Data Current Yes    
Auditor Firm ID 49    
Auditor Name RSM US LLP    
Auditor Location Rochester, Minnesota