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Note 6 - Claims Liabilities (Details Textual) - USD ($) | Dec. 31, 2020 | Sep. 01, 2020 | Dec. 31, 2019 | Sep. 01, 2019
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Self Insurance Auto Liability Claims Threshold Amount |  | $ 2,000,000.0 |  | $ 1,000,000.0
Workers Compensation Self Insured Retention | $ 500,000 |  |  |
Workers Compensation Per Occurrence Excess Policy | 500,000 |  |  |
Letters of Credit Outstanding, Amount | 310,000 |  | $ 430,000 |
Stop Loss for Self Insurance for Employee Health Claims Per Covered Employee Per Year | 350,000 |  |  |
Cargo Loss Coverage [Member] |  |  |  |
Per Occurrence Deductibles | 10,000 |  |  |
Auto Liability Coverage [Member] |  |  |  |
Self Insurance Auto Liability Claims Threshold Amount | 2,000,000.0 |  |  | $ 1,000,000.0
Workers Compensation Coverage [Member] |  |  |  |
Letters of Credit Outstanding, Amount | 310,000 |  |  |
Certificates of Deposit, at Carrying Value | $ 300,000 |  |  |

X
- Definition The amount of insurance deductibles on a per occurrence basis. + References No definition available. + Details
Name: | ptsi_PerOccurrenceDeductibles
Namespace Prefix: | ptsi_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents self insurance auto liability claims threshold amount. + References No definition available. + Details
Name: | ptsi_SelfInsuranceAutoLiabilityClaimsThresholdAmount
Namespace Prefix: | ptsi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Stop loss for self insurance for employee health claims. A stop loss is a policy that pays above a certain amount to 'stop' any more loss to the company. Similar to a large deductible policy. + References No definition available. + Details
Name: | ptsi_StopLossForSelfInsuranceForEmployeeHealthClaimsPerCoveredEmployeePerYear
Namespace Prefix: | ptsi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition An insurance policy which covers workers' compensation for occurrence excess. + References No definition available. + Details
Name: | ptsi_WorkersCompensationPerOccurrenceExcessPolicy
Namespace Prefix: | ptsi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The amount of self-insurance retention for workers' compensation claims. + References No definition available. + Details
Name: | ptsi_WorkersCompensationSelfInsuredRetention
Namespace Prefix: | ptsi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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X
- Definition A savings certificate entitling the Entity (that is, bearer) to receive interest at an established maturity date, based upon a fixed interest rate. A certificate of deposit may be issued in any denomination. Certificates of deposit are generally issued by commercial banks and, therefore, insured by the FDIC (up to the prescribed limit). Certificates of deposit generally restrict holders from withdrawing funds on demand without the incurrence of penalties. Generally, only certificates of deposit with original maturities of three months or less qualify as cash equivalents. Original maturity means original maturity to the entity holding the investment. As a related example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three months. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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Balance Type: | debit
Period Type: | instant

X
- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis=ptsi_CargoLossCoverageMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis=ptsi_AutoLiabilityCoverageMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
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- Details
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Data Type: | na
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