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Note 4 - Marketable Equity Securities - Unrealized Gains and Losses on Marketable Equity Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Gross unrealized gains	$ 7,048	$ 7,808
Gross unrealized losses	4,967	2,443
Net unrealized gains	$ 2,081	$ 5,365

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