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 $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Basic Net Income per Share [Abstract]    
Net Income Attributable to Trecora Resources $ 5,784us-gaap_NetIncomeLoss $ 2,599us-gaap_NetIncomeLoss
Weighted average number of shares outstanding, basic (in shares) 24,309,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 24,151,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Net Income Attributable to Trecora Resources (in dollars per share) $ 0.24us-gaap_EarningsPerShareBasic $ 0.11us-gaap_EarningsPerShareBasic
Diluted Net Income per Share [Abstract]    
Net Income Attributable to Trecora Resources $ 5,784us-gaap_NetIncomeLossAttributableToParentDiluted $ 2,599us-gaap_NetIncomeLossAttributableToParentDiluted
Dilutive stock options outstanding (in shares) 717,000us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements 767,000us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
Unvested restricted stock grant 118,000us-gaap_IncrementalCommonSharesAttributableToContingentlyIssuableShares 0us-gaap_IncrementalCommonSharesAttributableToContingentlyIssuableShares
Weighted average number of shares outstanding, diluted (in shares) 25,144,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 24,918,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Net Income Attributable to Trecora Resources (in dollars per share) $ 0.23us-gaap_EarningsPerShareDiluted $ 0.10us-gaap_EarningsPerShareDiluted
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Number of shares held in treasury by an outside party (in shares) 300,000trec_NumberOfSharesHeldInTreasuryByOutsideParty 300,000trec_NumberOfSharesHeldInTreasuryByOutsideParty
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) 1,527,091us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_EmployeeStockOptionMember
619,568us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_EmployeeStockOptionMember
Warrants [Member]    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Antidilutive securities excluded from computation of earnings per share (in shares) 1,527,091us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_WarrantMember
619,568us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_WarrantMember