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

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to other deductible tax credit carryforwards not separately disclosed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319 + Details
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from the allowance for doubtful accounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=29652012&loc=d3e28680-109314 + Details
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