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Note B - Recent Accounting Pronouncements (Details Textual) $ in Millions	6 Months Ended
	Jun. 30, 2016 USD ($)
Decrease in Current Deferred Income Tax Liability and Increase in Net Noncurrent Deferred Tax Liability [Member] | December 31, 2015 [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

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

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_CreationDateAxis=ptsi_December312015Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: