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Note 3 - Marketable Equity Securities - Recognized Gains (Losses) in Market Value for Securities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Trading securities
Recognized gain	$ 146	$ 8
Recognized gain		146
Securities transferred from trading to available-for-sale	(81)
Change in net recognized gain (loss)	$ (65)	$ 138

X

- Definition

This item represents the difference between the gross amount of gains (losses) included in earnings for transfers of securities from the trading category into the available-for-sale category. Such net gain (loss) included in earnings represents the net unrealized gain (loss) which had been included in other comprehensive income and is associated with the securities transferred from the trading category into the available-for-sale category.

+ References

No definition available.

+ Details

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

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

Amount of increase (decrease) in the fair value of equity or debt securities classified as trading.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 19
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3444-108585

+ Details

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

X

- References

No definition available.

+ Details

Name:	us-gaap_TradingSecuritiesAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration