Annual report pursuant to Section 13 and 15(d)

INCOME TAXES (Details)

v2.4.1.9
INCOME TAXES (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Provision for income taxes [Abstract]      
Current federal provision $ 8,756,000us-gaap_CurrentFederalTaxExpenseBenefit $ 6,748,000us-gaap_CurrentFederalTaxExpenseBenefit $ 4,821,000us-gaap_CurrentFederalTaxExpenseBenefit
Current state provision 296,000us-gaap_CurrentStateAndLocalTaxExpenseBenefit 233,000us-gaap_CurrentStateAndLocalTaxExpenseBenefit 199,000us-gaap_CurrentStateAndLocalTaxExpenseBenefit
Deferred federal provision (benefit) (1,893,000)us-gaap_DeferredFederalIncomeTaxExpenseBenefit 1,173,000us-gaap_DeferredFederalIncomeTaxExpenseBenefit 882,000us-gaap_DeferredFederalIncomeTaxExpenseBenefit
Deferred state provision (benefit) (12,000)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit (7,000)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit 2,000us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit
Income tax expense 7,147,000us-gaap_IncomeTaxExpenseBenefit 8,147,000us-gaap_IncomeTaxExpenseBenefit 5,904,000us-gaap_IncomeTaxExpenseBenefit
Federal statutory rate (in hundredths) 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
Effective tax rate in income tax expense and the Federal statutory rate [Abstract]      
Income taxes at U.S. statutory rate 7,952,000us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate 9,675,000us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate 5,679,000us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
State taxes, net of federal benefit 181,000us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes 139,000us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes 132,000us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes
Permanent and other items (915,000)us-gaap_IncomeTaxReconciliationOtherAdjustments (644,000)us-gaap_IncomeTaxReconciliationOtherAdjustments (250,000)us-gaap_IncomeTaxReconciliationOtherAdjustments
Increase (decrease) in valuation allowance (71,000)us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance (1,023,000)us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance 343,000us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance
Income tax expense 7,147,000us-gaap_IncomeTaxExpenseBenefit 8,147,000us-gaap_IncomeTaxExpenseBenefit 5,904,000us-gaap_IncomeTaxExpenseBenefit
Current and future Federal effective tax rate (in hundredths) 35.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations    
Deferred tax liabilities [Abstract]      
Plant, pipeline and equipment (8,352,000)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment (8,507,000)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment  
Other assets 0us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsOther (43,000)us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsOther  
Investment in AMAK (4,382,000)us-gaap_DeferredTaxLiabilitiesInvestmentInNoncontrolledAffiliates (4,757,000)us-gaap_DeferredTaxLiabilitiesInvestmentInNoncontrolledAffiliates  
Total deferred tax liabilities (12,734,000)us-gaap_DeferredIncomeTaxLiabilities (13,307,000)us-gaap_DeferredIncomeTaxLiabilities  
Deferred tax assets [Abstract]      
Accounts receivable 276,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts 260,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts  
Inventory 1,018,000us-gaap_DeferredTaxAssetsInventory 131,000us-gaap_DeferredTaxAssetsInventory  
Mineral interests 376,000us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment 376,000us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment  
Unrealized loss on swap agreements 196,000us-gaap_DeferredTaxAssetsDerivativeInstruments 214,000us-gaap_DeferredTaxAssetsDerivativeInstruments  
Environmental 0trec_DeferredTaxAssetsEnvironmental 71,000trec_DeferredTaxAssetsEnvironmental  
Post-retirement benefits 327,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits 373,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits  
Stock-based compensation 1,705,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost 1,015,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost  
Intangible assets 229,000us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets 0us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets  
Deferred revenue 164,000us-gaap_DeferredTaxAssetsDeferredIncome 654,000us-gaap_DeferredTaxAssetsDeferredIncome  
Gross deferred tax assets 4,291,000us-gaap_DeferredTaxAssetsGross 3,094,000us-gaap_DeferredTaxAssetsGross  
Valuation allowance (376,000)us-gaap_DeferredTaxAssetsValuationAllowance (447,000)us-gaap_DeferredTaxAssetsValuationAllowance  
Total net deferred tax assets 3,915,000us-gaap_DeferredTaxAssetsNet 2,647,000us-gaap_DeferredTaxAssetsNet  
Net deferred tax liabilities (8,819,000)us-gaap_DeferredTaxAssetsLiabilitiesNet (10,660,000)us-gaap_DeferredTaxAssetsLiabilitiesNet  
Current [Abstract]      
Deferred tax asset 1,652,000us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent 1,324,000us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent  
Non-current [Abstract]      
Deferred tax assets 3,269,000us-gaap_DeferredTaxAssetsGrossNoncurrent 1,764,000us-gaap_DeferredTaxAssetsGrossNoncurrent  
Deferred tax liability (13,364,000)us-gaap_DeferredTaxLiabilitiesGrossNoncurrent (13,301,000)us-gaap_DeferredTaxLiabilitiesGrossNoncurrent  
Valuation allowance (376,000)us-gaap_DeferredTaxAssetsValuationAllowanceNoncurrent (447,000)us-gaap_DeferredTaxAssetsValuationAllowanceNoncurrent  
Non-current deferred tax liability, net (10,471,000)us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent (11,984,000)us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent  
Net deferred tax liabilities (8,819,000)us-gaap_DeferredTaxAssetsLiabilitiesNet (10,660,000)us-gaap_DeferredTaxAssetsLiabilitiesNet  
Decrease in valuation allowance 71,000us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount 1,023,000us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount  
Income tax liability in Saudi Arabia $ 0trec_IncomeTaxLiabilityInSaudiArabia $ 0trec_IncomeTaxLiabilityInSaudiArabia $ 0trec_IncomeTaxLiabilityInSaudiArabia