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Note 4 - Marketable Equity Securities - Unrealized Gains and Losses on Marketable Equity Securities (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Gross unrealized gains | $ 5,668 | $ 10,150
Gross unrealized losses | 3,721 | 126
Net unrealized gains | $ 1,947 | $ 10,024

X
- Definition The amount of accumulated gross unrealized gain on equity securities. + References No definition available. + Details
Name: | ptsi_EquitySecuritiesFvniAccumulatedUnrealizedGain
Namespace Prefix: | ptsi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The amount of accumulated unrealized gain (loss) on equity securities. + References No definition available. + Details
Name: | ptsi_EquitySecuritiesFvniAccumulatedUnrealizedGainLoss
Namespace Prefix: | ptsi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The amount of accumulated gross unrealized loss on equity securities. + References No definition available. + Details
Name: | ptsi_EquitySecuritiesFvniAccumulatedUnrealizedLoss
Namespace Prefix: | ptsi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant