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Condensed Consolidated Statements of Comprehensive Income (Unaudited) (Parentheticals) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Deferred income taxes	$ (551)	$ 31
Deferred income taxes	0	89
Deferred income taxes	$ (15)	$ 181

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