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, 2017
Mar. 31, 2016
Basic Net Income per Share [Abstract]    
Net Income Attributable to Trecora Resources $ 1,487 $ 7,224
Weighted average number of shares outstanding, basic (in shares) 24,240,000 24,484,000
Net Income Attributable to Trecora Resources (in dollars per share) $ 0.06 $ 0.30
Unvested restricted stock grant (in shares) 321,000 282,000
Dilutive stock options outstanding (in shares) 493,000 319,000
Diluted Net Income per Share [Abstract]    
Net Income Attributable to Trecora Resources $ 1,487 $ 7,224
Weighted average number of shares outstanding, diluted (in shares) 25,054,000 25,085,000
Net Income Attributable to Trecora Resources (in dollars per share) $ 0.06 $ 0.29
Potential common stock shares issuable upon exercise of options (in shares) 1,344,087 1,368,437
Treasury of TOCCO included in earnings per share calculation (in shares)   300,000