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Note 16 - Commitments and Contingencies (Details Textual) - USD ($) | Mar. 31, 2020 | Dec. 31, 2021 | Sep. 01, 2020 | Jul. 31, 2020 | Sep. 01, 2019
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Self Insurance Auto Liability Claims Threshold Amount |  |  | $ 2,000,000.0 |  | $ 1,000,000.0
Self Insurance Auto Liability Claims Threshold Amount |  |  | $ 2,000,000.0 |  | $ 1,000,000.0
Minimum [Member] |  |  |  |  |
Self Insurance Liability Claims, Exceeding Amount Reserve Threshold |  | $ 2,000,000.0 |  |  |
Settlement Of Collective And Class Action Lawsuit [Member] |  |  |  |  |
Loss Contingency Accrual, Ending Balance |  |  |  | $ 16,500,000 |
Litigation Settlement, Amount Awarded to Other Party | $ 421,000 |  |  |  |

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- Definition The minimum amount of expected claims for which claims will be reserved in the reporting period. + References No definition available. + Details
Name: | ptsi_SelfInsuranceAutoClaimsExceedingAmountReserveThreshold
Namespace Prefix: | ptsi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- 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

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- Definition Amount awarded to other party in judgment or settlement of litigation. + References No definition available. + Details
Name: | us-gaap_LitigationSettlementAmountAwardedToOtherParty
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Amount of loss contingency liability. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121557415&loc=d3e14326-108349 + Details
Name: | us-gaap_LossContingencyAccrualAtCarryingValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_LitigationCaseAxis=ptsi_SettlementOfCollectiveAndClassActionLawsuitMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |