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Note D - Marketable Equity Securities - Unrealized Gains and Losses on Marketable Equity Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Gross unrealized gains	$ 7,651	$ 10,150
Gross unrealized losses	1,083	126
Net unrealized gains	$ 6,568	$ 10,024

X

- Definition

The amount of accumulated gross unrealized gain on equity securities.

+ References

No definition available.

+ Details

Name:	ptsi_EquitySecuritiesFvniAccumulatedUnrealizedGain
Namespace Prefix:	ptsi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The amount of accumulated unrealized gain (loss) on equity securities.

+ References

No definition available.

+ Details

Name:	ptsi_EquitySecuritiesFvniAccumulatedUnrealizedGainLoss
Namespace Prefix:	ptsi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The amount of accumulated gross unrealized loss on equity securities.

+ References

No definition available.

+ Details

Name:	ptsi_EquitySecuritiesFvniAccumulatedUnrealizedLoss
Namespace Prefix:	ptsi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant