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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
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Trading securities |  |  |
Recognized gain (loss) | $ 8 ptsi_RecognizedGainlossTradingSecurities | $ (26)ptsi_RecognizedGainlossTradingSecurities | $ (16)ptsi_RecognizedGainlossTradingSecurities
Change in net recognized gain (loss) | 138 us-gaap_IncreaseDecreaseInTradingSecurities | 34 us-gaap_IncreaseDecreaseInTradingSecurities | (10)us-gaap_IncreaseDecreaseInTradingSecurities
Recognized gain (loss) | $ 146 ptsi_RecognizedGainlossTradingSecurities | $ 8 ptsi_RecognizedGainlossTradingSecurities | $ (26)ptsi_RecognizedGainlossTradingSecurities

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- Definition Cumulative amount of gain (loss) recognized as income (or loss) from trading securities. + References No definition available. + Details
Name: | ptsi_RecognizedGainlossTradingSecurities
Namespace Prefix: | ptsi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

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- Definition Amount of increase (decrease) in the fair value of equity or debt securities classified as trading. + 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 (a) -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 230 -SubTopic 10 -Section 45 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3444-108585 + Details
Name: | us-gaap_IncreaseDecreaseInTradingSecurities
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration