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Note 12 - Stock-Based Compensation (Details) (USD $) | 3 Months Ended | 12 Months Ended | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Mar. 31, 2012 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Nov. 30, 2014 | May 31, 2012 | Nov. 30, 2010 | Dec. 31, 2014 | Mar. 31, 2014 | Mar. 31, 2013 | Dec. 31, 2011 | Mar. 02, 2006
Note 12 - Stock-Based Compensation (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in Shares) | 5,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value |  | $ 263,000 us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1 | $ 346,000 us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1 | $ 268,000 us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1 |  |  |  |  |  |  |  |
Allocated Share-based Compensation Expense |  | 270,000 us-gaap_AllocatedShareBasedCompensationExpense | 317,000 us-gaap_AllocatedShareBasedCompensationExpense | 352,000 us-gaap_AllocatedShareBasedCompensationExpense |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Grants in Period (in Shares) |  |  | 179,000 ptsi_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsAdditionalGrantsInPeriod | 199,000 ptsi_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsAdditionalGrantsInPeriod |  |  |  |  |  |  |  |
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense |  | 106,000 us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense | 123,000 us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense | 139,000 us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense |  |  |  |  |  |  |  |
Allocated Share-based Compensation Expense, Impact on Earnings Per Share (in Dollars per share) |  | $ (0.02)ptsi_AllocatedShareBasedCompensationExpenseImpactonEarningsPerShare |  | $ 0.02 ptsi_AllocatedShareBasedCompensationExpenseImpactonEarningsPerShare |  |  |  |  |  |  |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized |  | 541,000 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized | 518,000 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized | 749,000 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized |  |  |  | 541,000 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized |  |  |  |
Share Price (in Dollars per share) |  | $ 51.84 us-gaap_SharePrice |  |  |  |  |  | 51.84 us-gaap_SharePrice |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in Dollars per share) |  |  | $ 5.13 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue | $ 5.96 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value (in Dollars per share) |  | $ 6.34 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue | $ 5.92 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue | $ 8.88 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value |  | 1,355,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue | 53,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue | 15,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue |  |  |  |  |  |  |  |
Employee Service Share-based Compensation, Cash Received from Exercise of Stock Options |  | 846,000 us-gaap_EmployeeServiceShareBasedCompensationCashReceivedFromExerciseOfStockOptions | 46,000 us-gaap_EmployeeServiceShareBasedCompensationCashReceivedFromExerciseOfStockOptions | 54,000 us-gaap_EmployeeServiceShareBasedCompensationCashReceivedFromExerciseOfStockOptions |  |  |  |  |  |  |  |
Amortization, Current Year [Member] |  |  |  |  |  |  |  |  |  |  |  |
Note 12 - Stock-Based Compensation (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized |  | 197,000 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis = ptsi_AmortizationCurrentYearMember |  |  |  |  |  | 197,000 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis = ptsi_AmortizationCurrentYearMember |  |  |  |
Amortization, Next Year [Member] |  |  |  |  |  |  |  |  |  |  |  |
Note 12 - Stock-Based Compensation (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized |  | 167,000 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis = ptsi_AmortizationNextYearMember |  |  |  |  |  | 167,000 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis = ptsi_AmortizationNextYearMember |  |  |  |
Amortization, Year 3 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Note 12 - Stock-Based Compensation (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized |  | 109,000 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis = ptsi_AmortizationYear4Member |  |  |  |  |  | 109,000 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis = ptsi_AmortizationYear4Member |  |  |  |
Amortization Year 4 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Note 12 - Stock-Based Compensation (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized |  | $ 68,000 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis = ptsi_AmortizationsYear4Member |  |  |  |  |  | 68,000 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis = ptsi_AmortizationsYear4Member |  |  |  |
Restricted Stock [Member] | Minimum [Member] | 2014 Stock Option Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |
Note 12 - Stock-Based Compensation (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price of Common Stock, Percent |  | 85.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardPurchasePriceOfCommonStockPercent / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember / us-gaap_PlanNameAxis = ptsi_StockOptionPlan2014Member / us-gaap_RangeAxis = us-gaap_MinimumMember |  |  |  |  |  |  |  |  |  |
Restricted Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |
Note 12 - Stock-Based Compensation (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement by Share Based Payment Award, Award Vesting Period, Percentage |  |  |  |  | 20.00%ptsi_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriodPercentage / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in Shares) |  | 12,524 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember |  |  | 9,500 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value (in Dollars per share) |  | $ 37.15 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember |  |  | $ 42.65 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value (in Dollars per share) |  | $ 18.17 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember |  |  |  |  |  |  |  |  |  |
Nonqualified Options [Member] | Minimum [Member] | 2014 Stock Option Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |
Note 12 - Stock-Based Compensation (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period |  | 5 years |  |  |  |  |  |  |  |  |  |
Nonqualified Options [Member] | Maximum [Member] | 2014 Stock Option Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |
Note 12 - Stock-Based Compensation (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period |  | 10 years |  |  |  |  |  |  |  |  |  |
Nonqualified Options [Member] | Key Employees [Member] |  |  |  |  |  |  |  |  |  |  |  |
Note 12 - Stock-Based Compensation (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement by Share Based Payment Award, Award Vesting Period, Percentage |  |  |  |  |  | 20.00%ptsi_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriodPercentage / us-gaap_AwardTypeAxis = ptsi_NonqualifiedOptionsMember / us-gaap_TitleOfIndividualAxis = ptsi_KeyEmployeesMember | 20.00%ptsi_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriodPercentage / us-gaap_AwardTypeAxis = ptsi_NonqualifiedOptionsMember / us-gaap_TitleOfIndividualAxis = ptsi_KeyEmployeesMember |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in Shares) |  |  |  |  |  | 104,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross / us-gaap_AwardTypeAxis = ptsi_NonqualifiedOptionsMember / us-gaap_TitleOfIndividualAxis = ptsi_KeyEmployeesMember | 50,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross / us-gaap_AwardTypeAxis = ptsi_NonqualifiedOptionsMember / us-gaap_TitleOfIndividualAxis = ptsi_KeyEmployeesMember |  |  |  |  |
Nonqualified Options [Member] | Annual Grant to Non-employee Member [Member] |  |  |  |  |  |  |  |  |  |  |  |
Note 12 - Stock-Based Compensation (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in Shares) |  |  |  |  |  |  |  | 9,500 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross / us-gaap_AwardTypeAxis = ptsi_NonqualifiedOptionsMember / us-gaap_TitleOfIndividualAxis = ptsi_AnnualGrantToNonEmployeeMember | 504 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross / us-gaap_AwardTypeAxis = ptsi_NonqualifiedOptionsMember / us-gaap_TitleOfIndividualAxis = ptsi_AnnualGrantToNonEmployeeMember |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Grants in Period (in Shares) |  |  |  |  |  |  |  |  | 94,000 ptsi_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsAdditionalGrantsInPeriod / us-gaap_AwardTypeAxis = ptsi_NonqualifiedOptionsMember / us-gaap_TitleOfIndividualAxis = ptsi_AnnualGrantToNonEmployeeMember |  |  |
Nonqualified Options [Member] | 2014 Stock Option Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |
Note 12 - Stock-Based Compensation (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement by Share Based Payment Award, Award Vesting Period, Percentage |  | 20.00%ptsi_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriodPercentage / us-gaap_AwardTypeAxis = ptsi_NonqualifiedOptionsMember / us-gaap_PlanNameAxis = ptsi_StockOptionPlan2014Member |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in Shares) |  | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant / us-gaap_AwardTypeAxis = ptsi_NonqualifiedOptionsMember / us-gaap_PlanNameAxis = ptsi_StockOptionPlan2014Member |  |  |  |  |  | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant / us-gaap_AwardTypeAxis = ptsi_NonqualifiedOptionsMember / us-gaap_PlanNameAxis = ptsi_StockOptionPlan2014Member |  |  |  |
Stock Award [Member] | Director [Member] | 2014 Stock Option Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |
Note 12 - Stock-Based Compensation (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in Shares) |  | 3,024 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = ptsi_StockAwardMember / us-gaap_PlanNameAxis = ptsi_StockOptionPlan2014Member / us-gaap_TitleOfIndividualAxis = us-gaap_DirectorMember |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value (in Dollars per share) |  | $ 19.88 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = ptsi_StockAwardMember / us-gaap_PlanNameAxis = ptsi_StockOptionPlan2014Member / us-gaap_TitleOfIndividualAxis = us-gaap_DirectorMember |  |  |  |  |  |  |  |  |  |
Stock Award [Member] | Director [Member] |  |  |  |  |  |  |  |  |  |  |  |
Note 12 - Stock-Based Compensation (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in Shares) |  |  |  |  |  |  |  |  |  | 5,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross / us-gaap_AwardTypeAxis = ptsi_StockAwardMember / us-gaap_TitleOfIndividualAxis = us-gaap_DirectorMember |  |
Performance Based Variable Nonqualified Stock Options [Member] | Key Employees [Member] |  |  |  |  |  |  |  |  |  |  |  |
Note 12 - Stock-Based Compensation (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in Shares) |  |  |  |  |  |  | 64,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross / us-gaap_AwardTypeAxis = ptsi_PerformanceBasedVariableNonqualifiedStockOptionsMember / us-gaap_TitleOfIndividualAxis = ptsi_KeyEmployeesMember |  |  |  |  |
Performance Based Variable Nonqualified Stock Options [Member] |  |  |  |  |  |  |  |  |  |  |  |
Note 12 - Stock-Based Compensation (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award Performance, Awards Earned (in Shares) |  |  |  |  |  |  |  |  |  |  | 4,442 ptsi_ShareBasedCompensationArrangementByShareBasedPaymentAwardPerformanceAwardsEarned / us-gaap_AwardTypeAxis = ptsi_PerformanceBasedVariableNonqualifiedStockOptionsMember |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Expirations in Period (in Shares) |  |  |  | 59,558 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExpirationsInPeriod / us-gaap_AwardTypeAxis = ptsi_PerformanceBasedVariableNonqualifiedStockOptionsMember |  |  |  |  |  |  |  |
Increase in Annual Grant of Options, Number of Shares [Member] |  |  |  |  |  |  |  |  |  |  |  |
Note 12 - Stock-Based Compensation (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Grants in Period (in Shares) |  |  |  |  |  |  |  |  | 60,000 ptsi_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsAdditionalGrantsInPeriod / us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis = ptsi_IncreaseInAnnualGrantOfOptionsNumberOfSharesMember |  |  |
Diluted [Member] |  |  |  |  |  |  |  |  |  |  |  |
Note 12 - Stock-Based Compensation (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Allocated Share-based Compensation Expense, Impact on Earnings Per Share (in Dollars per share) |  |  | $ (0.02)ptsi_AllocatedShareBasedCompensationExpenseImpactonEarningsPerShare / us-gaap_StatementScenarioAxis = ptsi_DilutedMember |  |  |  |  |  |  |  |  |
Basic [Member] |  |  |  |  |  |  |  |  |  |  |  |
Note 12 - Stock-Based Compensation (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Allocated Share-based Compensation Expense, Impact on Earnings Per Share (in Dollars per share) |  |  | $ (0.03)ptsi_AllocatedShareBasedCompensationExpenseImpactonEarningsPerShare / us-gaap_StatementScenarioAxis = ptsi_BasicMember |  |  |  |  |  |  |  |  |
Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |
Note 12 - Stock-Based Compensation (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in Dollars per share) |  |  |  | $ 5.54 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_RangeAxis = us-gaap_MinimumMember |  |  |  |  |  |  |  |
Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |
Note 12 - Stock-Based Compensation (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in Dollars per share) |  |  |  | $ 6.06 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |  |  |  |  |  |
2006 Stock Option Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |
Note 12 - Stock-Based Compensation (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in Shares) |  |  |  |  |  |  |  |  |  |  |  | 750,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized / us-gaap_PlanNameAxis = ptsi_StockOptionPlan2006Member
2014 Stock Option Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |
Note 12 - Stock-Based Compensation (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in Shares) |  | 361,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant / us-gaap_PlanNameAxis = ptsi_StockOptionPlan2014Member |  |  |  |  |  | 361,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant / us-gaap_PlanNameAxis = ptsi_StockOptionPlan2014Member |  |  |  |

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- Definition Unrecognized cost of unvested share-based compensation awards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(4) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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