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Note C - Marketable Equity Securities (Details) - Recognized Gains (Losses) in Market Value for Securities (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Trading securities
Recognized loss at end of period	$ (6)	$ (13)	$ (6)	$ (13)
Beginning of Period [Member]
Trading securities
Recognized gain (loss)	(12)	2	(26)	(16)
Gain (Loss) on Investments, Before Tax [Member]
Trading securities
Recognized gain (loss)	6	(15)	20	3
Gain (Loss) on Investments, Net of Tax [Member]
Trading securities
Recognized gain (loss)	$ 4	$ (9)	$ 12	$ 2

X

- Details

Name:	ptsi_TradingSecuritiesAbstract0
Namespace Prefix:	ptsi_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

This item represents the gain (loss) recognized during the period from the sale of trading securities.

+ References

No definition available.

+ Details

Name:	ptsi_TradingSecuritiesRecognizedGainloss
Namespace Prefix:	ptsi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

This item represents the loss recognized during the period from the sale of trading securities.

+ References

No definition available.

+ Details

Name:	ptsi_TradingSecuritiesRecognizedLoss
Namespace Prefix:	ptsi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration