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Note 11 - Federal and State Income Taxes (Details) - Significant Components of Deferred Tax Liabilities and Assets (USD $)
Dec. 31, 2014
Dec. 31, 2013
Deferred tax liabilities:    
Property and equipment $ 64,341,000us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment $ 73,099,000us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Unrealized gains on securities 3,918,000us-gaap_DeferredTaxLiabilitiesUnrealizedGainsOnTradingSecurities 3,769,000us-gaap_DeferredTaxLiabilitiesUnrealizedGainsOnTradingSecurities
Prepaid expenses and other 3,837,000us-gaap_DeferredTaxLiabilitiesPrepaidExpenses 2,498,000us-gaap_DeferredTaxLiabilitiesPrepaidExpenses
Total deferred tax liabilities 7,755,000us-gaap_DeferredTaxLiabilitiesGrossCurrent 6,267,000us-gaap_DeferredTaxLiabilitiesGrossCurrent
Total deferred tax liabilities 64,341,000us-gaap_DeferredTaxLiabilitiesGrossNoncurrent 73,099,000us-gaap_DeferredTaxLiabilitiesGrossNoncurrent
Deferred tax assets:    
Allowance for doubtful accounts 612,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts 561,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts
Alternative minimum tax credit carryforward 1,206,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax 318,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax
QAFMV tax credit carryforward 864,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsOther 864,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsOther
New hire tax credit 124,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsOther 124,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsOther
Compensated absences 564,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation 594,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation
Self-insurance allowances 2,592,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsSelfInsurance 1,027,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsSelfInsurance
Share-based compensation 579,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost 702,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost
Goodwill 28,000us-gaap_DeferredTaxAssetsGoodwillAndIntangibleAssets 37,000us-gaap_DeferredTaxAssetsGoodwillAndIntangibleAssets
Marketable equity securities 686,000us-gaap_DeferredTaxAssetsInvestments 767,000us-gaap_DeferredTaxAssetsInvestments
Net operating loss carryover 4,392,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwards 21,255,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Capital loss carryover 339,000us-gaap_DeferredTaxAssetsCapitalLossCarryforwards 667,000us-gaap_DeferredTaxAssetsCapitalLossCarryforwards
Non-competition agreement 23,000ptsi_DeferredTaxAssetsNonCompetitionAgreement 30,000ptsi_DeferredTaxAssetsNonCompetitionAgreement
Other 11,000us-gaap_DeferredTaxAssetsOther  
Other   5,000ptsi_DeferredTaxAssetsOtherNonCurrent
Total deferred tax assets 4,804,000us-gaap_DeferredTaxAssetsGrossCurrent 3,616,000us-gaap_DeferredTaxAssetsGrossCurrent
Total deferred tax assets 7,216,000us-gaap_DeferredTaxAssetsGrossNoncurrent 23,335,000us-gaap_DeferredTaxAssetsGrossNoncurrent
Net deferred tax liability 2,951,000us-gaap_DeferredTaxLiabilities 2,651,000us-gaap_DeferredTaxLiabilities
Net deferred tax liability $ 57,125,000us-gaap_DeferredTaxLiabilitiesNoncurrent $ 49,764,000us-gaap_DeferredTaxLiabilitiesNoncurrent