Annual report pursuant to Section 13 and 15(d)


Cover - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Feb. 26, 2021
Jun. 30, 2020
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2020    
Current Fiscal Year End Date --12-31    
Document Transition Report false    
Entity File Number 1-33926    
Entity Registrant Name TRECORA RESOURCES    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 75-1256622    
Entity Address, Address Line One 1650 Hwy 6 S, Suite 190    
Entity Address, City or Town Sugar Land    
Entity Address, State or Province TX    
Entity Address, Postal Zip Code 77478    
City Area Code 281    
Local Phone Number 980-5522    
Title of 12(b) Security Common Stock, par value $0.10 per share    
Trading Symbol TREC    
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    
Entity Public Float     $ 119
Entity Common Stock, Shares Outstanding   24,834,693  
Documents Incorporated by Reference Certain information required to be furnished pursuant to Part III of this Form 10–K will be set forth in, and will be incorporated by reference from, the registrant’s definitive proxy statement for the 2021 Annual Meeting of Stockholders anticipated to be held on May 14, 2021 to be filed by the registrant with the Securities and Exchange Commission pursuant to Regulation 14A within 120 days after the registrant’s fiscal year ended December 31, 2020.    
Entity Central Index Key 0000007039    
Document Fiscal Year Focus 2020    
Document Fiscal Period Focus FY    
Amendment Flag false