XML 16 R1.htm IDEA: XBRL DOCUMENT v3.24.0.1
Document And Entity Information - USD ($)
 12 Months Ended
Dec. 31, 2023
Mar. 14, 2024
Jun. 30, 2023
Document Information [Line Items]      
Entity Central Index Key 0001337298    
Entity Registrant Name FUTUREFUEL CORP.    
Amendment Flag false    
Current Fiscal Year End Date --12-31    
Document Fiscal Period Focus FY    
Document Fiscal Year Focus 2023    
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2023    
Document Transition Report false    
Entity File Number 0-52577    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 20-3340900    
Entity Address, Address Line One 8235 Forsyth Blvd., Suite 400    
Entity Address, City or Town St Louis    
Entity Address, State or Province MO    
Entity Address, Postal Zip Code 63105    
City Area Code 314    
Local Phone Number 854-8352    
Title of 12(b) Security Common Stock    
Trading Symbol FF    
Security Exchange Name NYSE    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Accelerated Filer    
Entity Small Business true    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag true    
Entity Shell Company false    
Document Financial Statement Error Correction [Flag] false    
Entity Public Float     $ 228,789,156
Entity Common Stock, Shares Outstanding   43,763,243  
Auditor Firm ID 49    
Auditor Name RSM US LLP    
Auditor Location St. Louis, Missouri