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 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Basic Net Income per Share [Abstract]        
Net Income Attributable to Trecora Resources $ 832 $ 10,252 $ 2,319 $ 17,476
Weighted average number of shares outstanding, basic (in shares) 24,256,000 24,204,000 24,248,000 24,344,000
Net Income Attributable to Trecora Resources (in dollars per share) $ 0.03 $ 0.42 $ 0.10 $ 0.72
Unvested restricted stock grant (in shares) 379,000 304,000 350,000 293,000
Dilutive stock options outstanding (in shares) 399,000 377,000 446,000 348,000
Diluted Net Income per Share [Abstract]        
Net Income Attributable to Trecora Resources $ 832 $ 10,252 $ 2,319 $ 17,476
Weighted average number of shares outstanding, diluted (in shares) 25,034,000 24,885,000 25,044,000 24,985,000
Net Income Attributable to Trecora Resources (in dollars per share) $ 0.03 $ 0.41 $ 0.09 $ 0.70
Potential common stock shares issuable upon exercise of options (in shares)     1,334,087 1,368,437
Treasury of TOCCO included in earnings per share calculation (in shares)       300,000