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, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Basic Net Income per Share [Abstract]        
Net Income Attributable to Trecora Resources $ 12,084 $ 6,374 $ 19,308 $ 12,158
Weighted average number of shares outstanding, basic (in shares) 24,504,000 24,354,000 24,494,000 24,331,000
Net Income Attributable to Trecora Resources (in dollars per share) $ 0.49 $ 0.26 $ 0.79 $ 0.50
Diluted Net Income per Share [Abstract]        
Net Income Attributable to Trecora Resources $ 12,084 $ 6,374 $ 19,308 $ 12,158
Unvested restricted stock grant (in shares) 304,000 148,000 293,000 133,000
Dilutive stock options outstanding (in shares) 377,000 653,000 348,000 686,000
Weighted average number of shares outstanding, diluted (in shares) 25,185,000 25,155,000 25,135,000 25,150,000
Net Income Attributable to Trecora Resources (in dollars per share) $ 0.48 $ 0.25 $ 0.77 $ 0.48
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Number of shares held in treasury by an outside party (in shares)   300,000   300,000
Number of shares held in treasury by an outside party transferred to parent for future issuances (in shares) 300,000   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)     1,368,437 1,497,771