Note 4 - Marketable Equity Securities - Unrealized Gains and Losses on Marketable Equity Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Gross unrealized gains	$ 12,458	$ 7,048
Gross unrealized losses	2,419	4,967
Unrealized gain	$ 10,039	$ 2,081

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