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v3.6.0.2

Consolidated Statements of Comprehensive Income (Parentheticals) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Deferred income taxes | $ (333) | $ (396) | $ (385)
Deferred income taxes | 269 | 316 | 0
Deferred income taxes | $ 1,390 | $ (588) | $ 533

X
- Definition Amount of deferred income tax expense (benefit) pertaining to the change in the fair value of marketable securities included in income (loss) from continuing operations. + References No definition available. + Details
Name: | ptsi_DeferredIncomeTaxExpenseBenefitChangeInFairValueOfMarketableSecurities
Namespace Prefix: | ptsi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of deferred income tax expense (benefit) pertaining to realized gains on marketable securities included in income (loss) from continuing operations. + References No definition available. + Details
Name: | ptsi_DeferredIncomeTaxExpenseBenefitRealizedGainsOnMarketableSecurities
Namespace Prefix: | ptsi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of deferred income tax expense (benefit) pertaining to unrealized losses on marketable securities included in income (loss) from continuing operations. + References No definition available. + Details
Name: | ptsi_DeferredIncomeTaxExpenseBenefitUnrealizedLossesOnMarketableSecurities
Namespace Prefix: | ptsi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration