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Consolidated Statements of Comprehensive Income (Parentheticals) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Deferred income taxes	$ (333)	$ (396)	$ (385)
Deferred income taxes	269	316	0
Deferred income taxes	$ 1,390	$ (588)	$ 533

X

- Definition

Amount of deferred income tax expense (benefit) pertaining to the change in the fair value of marketable securities included in income (loss) from continuing operations.

+ References

No definition available.

+ Details

Name:	ptsi_DeferredIncomeTaxExpenseBenefitChangeInFairValueOfMarketableSecurities
Namespace Prefix:	ptsi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amount of deferred income tax expense (benefit) pertaining to realized gains on marketable securities included in income (loss) from continuing operations.

+ References

No definition available.

+ Details

Name:	ptsi_DeferredIncomeTaxExpenseBenefitRealizedGainsOnMarketableSecurities
Namespace Prefix:	ptsi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amount of deferred income tax expense (benefit) pertaining to unrealized losses on marketable securities included in income (loss) from continuing operations.

+ References

No definition available.

+ Details

Name:	ptsi_DeferredIncomeTaxExpenseBenefitUnrealizedLossesOnMarketableSecurities
Namespace Prefix:	ptsi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration