Quarterly report pursuant to Section 13 or 15(d)

STOCK-BASED COMPENSATION - Additional Information (Details)

v3.21.2
STOCK-BASED COMPENSATION - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Jul. 31, 2008
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Compensation expense $ 600 $ 500 $ 1,695 $ 1,423  
Restricted Stock Unit Awards          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period     3 years    
Stock Option Plan for Key Employees          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares authorized (in shares)         1,000,000
Stock Option Plan for Key Employees | Stock Options          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock-based compensation, term of award     10 years    
Options granted (in shares) 0 0 0 0  
Options, weighted average grant-date fair value (in dollars per share) $ 0 $ 0 $ 0 $ 0  
Stock Option Plan for Key Employees | Stock Options | Common Stock          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Options outstanding, in-the-money (in shares) 100,000   100,000    
Stock Option Plan for Key Employees | Stock Options | Minimum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period     4 years    
Stock Option Plan for Key Employees | Stock Options | Maximum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period     5 years    
Stock Option Plan for Key Employees | Stock Options and Warrants          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Options granted (in shares) 0   0    
Awards granted during period (in shares)   0   0  
Trecora Resources Stock and Incentive Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares authorized (in shares) 2,500,000   2,500,000    
Trecora Resources Stock and Incentive Plan | Restricted Stock Unit Awards          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period     3 years    
Trecora Resources Stock and Incentive Plan | Restricted Stock Unit Awards | Director          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period     1 year