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, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Jun. 30, 2016
Basic Net Income per Share [Abstract]          
Net Income Attributable to Trecora Resources $ 2,799 [1] $ 5,318 $ 20,275 [1] $ 17,476  
Weighted average number of shares outstanding, basic (in shares) 24,223,000 [1] 24,369,000 24,304,000 [1] 24,344,000  
Net Income Attributable to Trecora Resources (in dollars per share) $ 0.12 [1] $ 0.22 $ 0.83 [1] $ 0.72  
Diluted Net Income per Share [Abstract]          
Net Income Attributable to Trecora Resources $ 2,799 [1] $ 5,318 $ 20,275 [1] $ 17,476  
Unvested restricted stock grant (in shares) 304,000 148,000 297,000 138,000  
Dilutive stock options outstanding (in shares) 394,000 711,000 363,000 694,000  
Weighted average number of shares outstanding, diluted (in shares) 24,921,000 [1] 25,228,000 24,964,000 [1] 25,176,000  
Net Income Attributable to Trecora Resources (in dollars per share) $ 0.11 [1] $ 0.21 $ 0.81 [1] $ 0.69  
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]          
Number of shares held in treasury by an outside party (in shares) 284,011 300,000 284,011 300,000  
Number of shares held in treasury by an outside party transferred to parent for future issuances (in shares)         300,000
Stock Options and Warrants [Member]          
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]          
Antidilutive securities excluded from computation of earnings per share (in shares)     1,348,437 1,497,771  
[1] Restated - See Note 3.