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Note B - Recent Accounting Pronouncements (Details Textual) $ in Millions	3 Months Ended
	Mar. 31, 2016 USD ($)
Decrease in Current Deferred Income Tax Liability and Increase in Net Noncurrent Deferred Tax Liability [Member]
Prior Period Reclassification Adjustment	$ 1.8

X

- Definition

The amount of a reclassification adjustment made to prior period financial statement amounts.

+ References

No definition available.

+ Details

Name:	us-gaap_PriorPeriodReclassificationAdjustment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Details

Name:	us-gaap_NewAccountingPronouncementEarlyAdoptionAxis=ptsi_DecreaseInCurrentDeferredIncomeTaxLiabilityAndIncreaseInNetNoncurrentDeferredTaxLiabilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: