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Note 16 - Commitments and Contingencies (Details Textual) | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Sep. 01, 2019 USD ($) | Dec. 31, 2015 | Dec. 31, 2014
Self Insurance Auto Liability Claims Threshold Amount |  |  |  | $ 1,000,000 |  |
Operating Leases Number of Trucks |  |  | 56 |  | 471 | 471
Operating Leases, Rent Expense, Total | $ 0 | $ 47,000 | $ 5,460,000 |  |  |
Settlement Of Collective And Class Action Lawsuit [Member] |  |  |  |  |  |
Loss Contingency Accrual, Ending Balance | $ 16,500,000 |  |  |  |  |

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- Definition Number of trucks under the operating lease. + References No definition available. + Details
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Namespace Prefix: | ptsi_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition Represents self insurance auto liability claims threshold amount. + References No definition available. + Details
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Namespace Prefix: | ptsi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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X
- Definition Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | debit
Period Type: | duration

X
- 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=118942415&loc=d3e14326-108349 + Details
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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |