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Note 15 - Commitments and Contingencies (Details Textual) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014
Operating Leases Number of Trucks | 56 |  | 471 | 471
Operating Leases, Rent Expense | $ 5,460,000 | $ 10,294,000 | $ 12,057,000 |

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

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
Name: | us-gaap_LeaseAndRentalExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration