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Note D - Marketable Equity Securities - Realized Gains on Marketable Equity Securities (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Sales proceeds		$ 2,928		$ 6,007
Cost of securities sold		405		1,338
Realized gain		2,523		4,669
Realized gain, net of taxes		$ 1,546		$ 2,862

X

- Definition

The cost of securities that sold during the period.

+ References

No definition available.

+ Details

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

X

- Definition

Amount of realized gain (loss) from sale of investment in equity security, net of related taxes.

+ References

No definition available.

+ Details

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

X

- Definition

The total amount of proceeds received for the sale of equity securities.

+ References

No definition available.

+ Details

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

X

- Definition

Amount of realized gain (loss) from sale of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 321
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=84241550&loc=SL75117546-209714

+ Details

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