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Consolidated Statements of Comprehensive Income (Parentheticals) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Deferred income taxes	$ 7,512us-gaap_DeferredIncomeTaxExpenseBenefit	$ 3,597us-gaap_DeferredIncomeTaxExpenseBenefit	$ 1,365us-gaap_DeferredIncomeTaxExpenseBenefit
Realized Gains on Marketable Securities [Member]
Deferred income taxes	(385)us-gaap_DeferredIncomeTaxExpenseBenefit / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = ptsi_RealizedGainsOnMarketableSecuritiesMember	(131)us-gaap_DeferredIncomeTaxExpenseBenefit / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = ptsi_RealizedGainsOnMarketableSecuritiesMember	(618)us-gaap_DeferredIncomeTaxExpenseBenefit / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = ptsi_RealizedGainsOnMarketableSecuritiesMember
Unrealized Losses on Marketable Securities [Member]
Deferred income taxes	0us-gaap_DeferredIncomeTaxExpenseBenefit / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = ptsi_UnrealizedLossesOnMarketableSecuritiesMember	11us-gaap_DeferredIncomeTaxExpenseBenefit / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = ptsi_UnrealizedLossesOnMarketableSecuritiesMember	27us-gaap_DeferredIncomeTaxExpenseBenefit / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = ptsi_UnrealizedLossesOnMarketableSecuritiesMember
Changes in Fair Value of Marketable Securities [Member]
Deferred income taxes	$ 533us-gaap_DeferredIncomeTaxExpenseBenefit / us-gaap_OtherComprehensiveIncomeLocationAxis = ptsi_ChangesInFairValueOfMarketableSecuritiesMember	$ 1,298us-gaap_DeferredIncomeTaxExpenseBenefit / us-gaap_OtherComprehensiveIncomeLocationAxis = ptsi_ChangesInFairValueOfMarketableSecuritiesMember	$ 304us-gaap_DeferredIncomeTaxExpenseBenefit / us-gaap_OtherComprehensiveIncomeLocationAxis = ptsi_ChangesInFairValueOfMarketableSecuritiesMember

X

- Definition

Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations.

+ 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 (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SAB TOPIC 6.I.7)

-URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.4-08.(h))

-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 08

-Paragraph h

-Article 4



Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 6

-Section I

-Subsection 7



Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Deferred Tax Expense (or Benefit)

-URI http://asc.fasb.org/extlink&oid=6510177



Reference 7: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 9

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319

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