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, 2018
Mar. 31, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Basic Net Income per Share:          
Net Income Attributable to Trecora Resources $ 2,215   $ 832 $ 4,567 $ 2,319
Net Income Attributable to Trecora Resources (in shares) 24,370,000   24,256,000 24,354,000 24,248,000
Net Income Attributable to Trecora Resources (in dollars per share) $ 0.09   $ 0.03 $ 0.19 $ 0.10
Unvested restricted stock units (in shares) 349,000   379,000 376,000 350,000
Dilutive stock options outstanding (in shares) 295,000   399,000 389,000 446,000
Diluted Net Income per Share:          
Net Income Attributable to Trecora Resources $ 2,215   $ 832 $ 4,567 $ 2,319
Net Income Attributable to Trecora Resources (in shares) 25,014,000   25,034,000 25,119,000 25,044,000
Net Income Attributable to Trecora Resources (in dollars per share) $ 0.09   $ 0.03 $ 0.18 $ 0.09
Potential common stock shares issuable upon exercise of options (in shares)       924,860 1,334,087
Treasury Stock [Member]          
Class of Stock [Line Items]          
Number of stock exchanged (in shares)   65,000      
Al Masane Al Kobra (AMAK) [Member]          
Class of Stock [Line Items]          
Number of stock exchanged (in shares)   24,489