Note D - Marketable Equity Securities - Unrealized Gains and Losses on Marketable Equity Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Gross unrealized gains	$ 5,310	$ 7,808
Gross unrealized losses	6,704	2,443
Net unrealized (loss) / gain	$ (1,394)	$ 5,365

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

No definition available.

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