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, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Basic Net Income per Share [Abstract]        
Net Income Attributable to Trecora Resources $ 1,718 $ 2,799 $ 4,037 $ 20,275
Weighted average number of shares outstanding, basic (in shares) 24,304,000 24,223,000 24,267,000 24,304,000
Net Income Attributable to Trecora Resources (in dollars per share) $ 0.07 $ 0.12 $ 0.17 $ 0.83
Unvested restricted stock grant (in shares) 379,000 304,000 360,000 297,000
Dilutive stock options outstanding (in shares) 474,000 394,000 455,000 363,000
Diluted Net Income per Share [Abstract]        
Net Income Attributable to Trecora Resources $ 1,718 $ 2,799 $ 4,037 $ 20,275
Weighted average number of shares outstanding, diluted (in shares) 25,157,000 24,921,000 25,082,000 24,964,000
Net Income Attributable to Trecora Resources (in dollars per share) $ 0.07 $ 0.11 $ 0.16 $ 0.81
Potential common stock shares issuable upon exercise of options (in shares)     1,334,087 1,348,437