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Note 3 - Marketable Equity Securities (Details) - Recognized Gains (Losses) in Market Value for Securities (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Trading securities |  |  |
Change in net recognized gain (loss) | $ 34 | $ (10) | $ (30)
Beginning of Period [Member] |  |  |
Trading securities |  |  |
Recognized gain (loss) | (26) | (16) | 14
Recognized gain (loss) | (26) | (16) | 14
End of Period [Member] |  |  |
Trading securities |  |  |
Recognized gain (loss) | 8 | (26) | (16)
Recognized gain (loss) | $ 8 | $ (26) | $ (16)

X
- Definition No authoritative reference available. + References No definition available. + Details
Name: | ptsi_ChangeInNetRecognizedlossGainTradingSecurities
Namespace Prefix: | ptsi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | ptsi_TradingSecuritiesAbstract0
Namespace Prefix: | ptsi_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition This item represents the gain (loss) recognized during the period from the sale of trading securities. + References No definition available. + Details
Name: | ptsi_TradingSecuritiesRecognizedGainloss
Namespace Prefix: | ptsi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration