Quarterly report pursuant to Section 13 or 15(d)

NET INCOME PER COMMON SHARE ATTRIBUTABLE TO TRECORA RESOURCES (Details)

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NET INCOME PER COMMON SHARE ATTRIBUTABLE TO TRECORA RESOURCES (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Basic Net Income per Share [Abstract]    
Net Income Attributable to Trecora Resources $ 2,352 $ 1,487
Weighted average number of shares outstanding, basic (in shares) 24,343,000 24,240,000
Net Income Attributable to Trecora Resources (in dollars per share) $ 0.10 $ 0.06
Unvested restricted stock units (in shares) 403,000 321,000
Dilutive stock options outstanding (in shares) 485,000 493,000
Diluted Net Income per Share [Abstract]    
Net Income Attributable to Trecora Resources $ 2,352 $ 1,487
Weighted average number of shares outstanding, diluted (in shares) 25,231,000 25,054,000
Net Income Attributable to Trecora Resources (in dollars per share) $ 0.09 $ 0.06
Potential common stock shares issuable upon exercise of options (in shares) 1,242,160 1,334,087
Treasury Stock [Member]    
Class of Stock [Line Items]    
Number of stock exchanged (in shares) 65,000  
Al Masane Al Kobra ("AMAK") [Member]    
Class of Stock [Line Items]    
Number of stock exchanged (in shares) 24,489