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Note 3 - Marketable Equity Securities (Details) - Recognized Gains (Losses) in Market Value for Securities (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Trading securities
Change in net recognized gain (loss)	$ 34	$ (10)	$ (30)
Beginning of Period [Member]
Trading securities
Recognized gain (loss)	(26)	(16)	14
Recognized gain (loss)	(26)	(16)	14
End of Period [Member]
Trading securities
Recognized gain (loss)	8	(26)	(16)
Recognized gain (loss)	$ 8	$ (26)	$ (16)

X

- Definition

No authoritative reference available.

+ References

No definition available.

+ Details

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

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