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 9 Months Ended
Sep. 30, 2018
Mar. 31, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Basic Net Income per Share:          
Net Income (Loss) Attributable to Trecora Resources $ (1,609)   $ 1,718 $ 2,958 $ 4,037
Net Income (Loss) Attributable to Trecora Resources (in shares) 24,483,000   24,304,000 24,397,000 24,267,000
Net Income (Loss) Attributable to Trecora Resources (in dollars per share) $ (0.07)   $ 0.07 $ 0.12 $ 0.17
Unvested restricted stock units (in shares) 398,000   379,000 383,000 360,000
Dilutive stock options outstanding (in shares) 294,000   474,000 358,000 455,000
Diluted Net Income per Share:          
Net Income (Loss) Attributable to Trecora Resources $ (1,609)   $ 1,718 $ 2,958 $ 4,037
Net Income (Loss) Attributable to Trecora Resources (in shares) 25,175,000   25,157,000 25,138,000 25,082,000
Net Income (Loss) Attributable to Trecora Resources (in dollars per share) $ (0.06)   $ 0.07 $ 0.12 $ 0.16
Potential common stock shares issuable upon exercise of options (in shares)       873,708 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