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, 2016
Mar. 31, 2015
Basic Net Income per Share [Abstract]    
Net Income Attributable to Trecora Resources $ 7,224 $ 5,784
Weighted average number of shares outstanding, basic (in shares) 24,484,000 24,309,000
Net Income Attributable to Trecora Resources (in dollars per share) $ 0.30 $ 0.24
Diluted Net Income per Share [Abstract]    
Net Income Attributable to Trecora Resources $ 7,224 $ 5,784
Unvested restricted stock grant (in shares) 282,000 118,000
Dilutive stock options outstanding (in shares) 319,000 717,000
Weighted average number of shares outstanding, diluted (in shares) 25,085,000 25,144,000
Net Income Attributable to Trecora Resources (in dollars per share) $ 0.29 $ 0.23
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
Stock Options [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 1,527,091
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 1,527,091