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Note C - Recognized Gains (Losses) in Market Value for Securities (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2015 USD ($)
Recognized gain at beginning of period	$ 146
Recognized gain at end of period	133
Net recognized loss	(13)
Net recognized loss, net of taxes	$ (8)

X

- Definition

Cumulative amount of gain (loss) recognized as income (or loss) from trading securities.

+ References

No definition available.

+ Details

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

X

- Definition

Cumulative amount of gain (loss) recognized as income (or loss) from 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

Amount of gain (loss) realized from securities classified as trading.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.7(c))
-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Trading Securities
-URI http://asc.fasb.org/extlink&oid=6526789

+ Details

Name:	us-gaap_TradingSecuritiesRealizedGainLoss
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration