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Note 6 - Long-term Debt (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Note 6 - Long-term Debt (Details) [Line Items]  
Line of Credit Facility, Interest Rate at Period End 1.65%us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd
Letters of Credit Outstanding, Amount (in Dollars) 1,101,000us-gaap_LettersOfCreditOutstandingAmount
Equipment Financing [Member] | Line of Credit [Member]  
Note 6 - Long-term Debt (Details) [Line Items]  
Long-term Debt, Weighted Average Interest Rate 2.66%us-gaap_LongtermDebtWeightedAverageInterestRate
/ us-gaap_CreditFacilityAxis
= us-gaap_LineOfCreditMember
/ us-gaap_DebtInstrumentAxis
= ptsi_EquipmentFinancingMember
Line of Credit [Member] | London Interbank Offered Rate (LIBOR) [Member]  
Note 6 - Long-term Debt (Details) [Line Items]  
Debt Instrument, Basis Spread on Variable Rate 1.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_CreditFacilityAxis
= us-gaap_LineOfCreditMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember
Line of Credit [Member]  
Note 6 - Long-term Debt (Details) [Line Items]  
Debt Instrument, Face Amount (in Dollars) 40,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_CreditFacilityAxis
= us-gaap_LineOfCreditMember
Ratio of Indebtedness to Net Capital 3.00us-gaap_RatioOfIndebtednessToNetCapital1
/ us-gaap_CreditFacilityAxis
= us-gaap_LineOfCreditMember